webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

6 files changed, 639 insertions, 0 deletions

diff --git a/Source/WebInspectorUI/UserInterface/Proxies/FormatterWorkerProxy.js b/Source/WebInspectorUI/UserInterface/Proxies/FormatterWorkerProxy.js
new file mode 100644
index 000000000..96159fb87
--- /dev/null
+++ b/Source/WebInspectorUI/UserInterface/Proxies/FormatterWorkerProxy.js
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+WebInspector.FormatterWorkerProxy = class FormatterWorkerProxy extends WebInspector.Object
+{
+    constructor()
+    {
+        super();
+
+        this._formatterWorker = new Worker("Workers/Formatter/FormatterWorker.js");
+        this._formatterWorker.addEventListener("message", this._handleMessage.bind(this));
+
+        this._nextCallId = 1;
+        this._callbacks = new Map;
+    }
+
+    // Static
+
+    static singleton()
+    {
+        if (!FormatterWorkerProxy.instance)
+            FormatterWorkerProxy.instance = new FormatterWorkerProxy;
+        return FormatterWorkerProxy.instance;
+    }
+
+    // Actions
+
+    formatJavaScript(sourceText, isModule, indentString, includeSourceMapData)
+    {
+        this.performAction("formatJavaScript", ...arguments);
+    }
+
+    // Public
+
+    performAction(actionName)
+    {
+        let callId = this._nextCallId++;
+        let callback = arguments[arguments.length - 1];
+        let actionArguments = Array.prototype.slice.call(arguments, 1, arguments.length - 1);
+
+        console.assert(typeof actionName === "string", "performAction should always have an actionName");
+        console.assert(typeof callback === "function", "performAction should always have a callback");
+
+        this._callbacks.set(callId, callback);
+        this._postMessage({callId, actionName, actionArguments});
+    }
+
+    // Private
+
+    _postMessage()
+    {
+        this._formatterWorker.postMessage(...arguments);
+    }
+
+    _handleMessage(event)
+    {
+        let data = event.data;
+
+        // Action response.
+        if (data.callId) {
+            let callback = this._callbacks.get(data.callId);
+            this._callbacks.delete(data.callId);
+            callback(data.result);
+            return;
+        }
+
+        console.error("Unexpected FormatterWorker message", data);
+    }
+};
diff --git a/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotDiffProxy.js b/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotDiffProxy.js
new file mode 100644
index 000000000..4dc62ed61
--- /dev/null
+++ b/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotDiffProxy.js
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+WebInspector.HeapSnapshotDiffProxy = class HeapSnapshotDiffProxy extends WebInspector.Object
+{
+    constructor(snapshotDiffObjectId, snapshot1, snapshot2, totalSize, totalObjectCount, categories)
+    {
+        super();
+
+        this._proxyObjectId = snapshotDiffObjectId;
+
+        console.assert(snapshot1 instanceof WebInspector.HeapSnapshotProxy);
+        console.assert(snapshot2 instanceof WebInspector.HeapSnapshotProxy);
+
+        this._snapshot1 = snapshot1;
+        this._snapshot2 = snapshot2;
+        this._totalSize = totalSize;
+        this._totalObjectCount = totalObjectCount;
+        this._categories = Map.fromObject(categories);
+    }
+
+    // Static
+
+    static deserialize(objectId, serializedSnapshotDiff)
+    {
+        let {snapshot1: serializedSnapshot1, snapshot2: serializedSnapshot2, totalSize, totalObjectCount, categories} = serializedSnapshotDiff;
+        // FIXME: The objectId for these snapshots is the snapshotDiff's objectId. Currently these
+        // snapshots are only used for static data so the proxing doesn't matter. However,
+        // should we serialize the objectId with the snapshot so we have the right objectId?
+        let snapshot1 = WebInspector.HeapSnapshotProxy.deserialize(objectId, serializedSnapshot1);
+        let snapshot2 = WebInspector.HeapSnapshotProxy.deserialize(objectId, serializedSnapshot2);
+        return new WebInspector.HeapSnapshotDiffProxy(objectId, snapshot1, snapshot2, totalSize, totalObjectCount, categories);
+    }
+
+    // Public
+
+    get snapshot1() { return this._snapshot1; }
+    get snapshot2() { return this._snapshot2; }
+    get totalSize() { return this._totalSize; }
+    get totalObjectCount() { return this._totalObjectCount; }
+    get categories() { return this._categories; }
+    get invalid() { return this._snapshot1.invalid || this._snapshot2.invalid; }
+
+    updateForCollectionEvent(event)
+    {
+        console.assert(!this.invalid);
+        if (!event.data.affectedSnapshots.includes(this._snapshot2._identifier))
+            return;
+
+        this.update(() => {
+            this.dispatchEventToListeners(WebInspector.HeapSnapshotProxy.Event.CollectedNodes, event.data);
+        });
+    }
+
+    allocationBucketCounts(bucketSizes, callback)
+    {
+        console.assert(!this.invalid);
+        WebInspector.HeapSnapshotWorkerProxy.singleton().callMethod(this._proxyObjectId, "allocationBucketCounts", bucketSizes, callback);
+    }
+
+    instancesWithClassName(className, callback)
+    {
+        console.assert(!this.invalid);
+        WebInspector.HeapSnapshotWorkerProxy.singleton().callMethod(this._proxyObjectId, "instancesWithClassName", className, (serializedNodes) => {
+            callback(serializedNodes.map(WebInspector.HeapSnapshotNodeProxy.deserialize.bind(null, this._proxyObjectId)));
+        });
+    }
+
+    update(callback)
+    {
+        console.assert(!this.invalid);
+        WebInspector.HeapSnapshotWorkerProxy.singleton().callMethod(this._proxyObjectId, "update", ({liveSize, categories}) => {
+            this._categories = Map.fromObject(categories);
+            callback();
+        });
+    }
+
+    nodeWithIdentifier(nodeIdentifier, callback)
+    {
+        console.assert(!this.invalid);
+        WebInspector.HeapSnapshotWorkerProxy.singleton().callMethod(this._proxyObjectId, "nodeWithIdentifier", nodeIdentifier, (serializedNode) => {
+            callback(WebInspector.HeapSnapshotNodeProxy.deserialize(this._proxyObjectId, serializedNode));
+        });
+    }
+};
diff --git a/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotEdgeProxy.js b/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotEdgeProxy.js
new file mode 100644
index 000000000..e4d44b176
--- /dev/null
+++ b/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotEdgeProxy.js
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+// Directed edge between two HeapSnapshotNodes 'from' and 'to'.
+
+WebInspector.HeapSnapshotEdgeProxy = class HeapSnapshotEdgeProxy
+{
+    constructor(objectId, fromIdentifier, toIdentifier, type, data)
+    {
+        this._proxyObjectId = objectId;
+
+        console.assert(type in WebInspector.HeapSnapshotEdgeProxy.EdgeType);
+
+        this.fromIdentifier = fromIdentifier;
+        this.toIdentifier = toIdentifier;
+        this.type = type;
+        this.data = data;
+
+        this.from = null;
+        this.to = null;
+    }
+
+    isPrivateSymbol()
+    {
+        if (WebInspector.isDebugUIEnabled())
+            return false;
+
+        return typeof this.data === "string" && this.data.startsWith("PrivateSymbol");
+    }
+
+    // Static
+
+    static deserialize(objectId, serializedEdge)
+    {
+        let {from, to, type, data} = serializedEdge;
+        return new WebInspector.HeapSnapshotEdgeProxy(objectId, from, to, type, data);
+    }
+};
+
+WebInspector.HeapSnapshotEdgeProxy.EdgeType = {
+    Internal: "Internal",       // No data.
+    Property: "Property",       // data is string property name.
+    Index: "Index",             // data is numeric index.
+    Variable: "Variable",       // data is string variable name.
+};
diff --git a/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotNodeProxy.js b/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotNodeProxy.js
new file mode 100644
index 000000000..908400d0e
--- /dev/null
+++ b/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotNodeProxy.js
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+WebInspector.HeapSnapshotNodeProxy = class HeapSnapshotNodeProxy
+{
+    constructor(snapshotObjectId, identifier, className, size, retainedSize, internal, gcRoot, dead, dominatorNodeIdentifier, hasChildren)
+    {
+        this._proxyObjectId = snapshotObjectId;
+
+        this.id = identifier;
+        this.className = className;
+        this.size = size;
+        this.retainedSize = retainedSize;
+        this.internal = internal;
+        this.gcRoot = gcRoot;
+        this.dead = dead;
+        this.dominatorNodeIdentifier = dominatorNodeIdentifier;
+        this.hasChildren = hasChildren;
+    }
+
+    // Static
+
+    static deserialize(objectId, serializedNode)
+    {
+        let {id, className, size, retainedSize, internal, gcRoot, dead, dominatorNodeIdentifier, hasChildren} = serializedNode;
+        return new WebInspector.HeapSnapshotNodeProxy(objectId, id, className, size, retainedSize, internal, gcRoot, dead, dominatorNodeIdentifier, hasChildren);
+    }
+
+    // Proxied
+
+    shortestGCRootPath(callback)
+    {
+        WebInspector.HeapSnapshotWorkerProxy.singleton().callMethod(this._proxyObjectId, "shortestGCRootPath", this.id, (serializedPath) => {
+            let isNode = false;
+            let path = serializedPath.map((component) => {
+                isNode = !isNode;
+                if (isNode)
+                    return WebInspector.HeapSnapshotNodeProxy.deserialize(this._proxyObjectId, component);
+                return WebInspector.HeapSnapshotEdgeProxy.deserialize(this._proxyObjectId, component);
+            });
+
+            for (let i = 1; i < path.length; i += 2) {
+                console.assert(path[i] instanceof WebInspector.HeapSnapshotEdgeProxy);
+                let edge = path[i];
+                edge.from = path[i - 1];
+                edge.to = path[i + 1];
+            }
+
+            callback(path);
+        });
+    }
+
+    dominatedNodes(callback)
+    {
+        WebInspector.HeapSnapshotWorkerProxy.singleton().callMethod(this._proxyObjectId, "dominatedNodes", this.id, (serializedNodes) => {
+            callback(serializedNodes.map(WebInspector.HeapSnapshotNodeProxy.deserialize.bind(null, this._proxyObjectId)));
+        });
+    }
+
+    retainedNodes(callback)
+    {
+        WebInspector.HeapSnapshotWorkerProxy.singleton().callMethod(this._proxyObjectId, "retainedNodes", this.id, ({retainedNodes: serializedNodes, edges: serializedEdges}) => {
+            let deserializedNodes = serializedNodes.map(WebInspector.HeapSnapshotNodeProxy.deserialize.bind(null, this._proxyObjectId));
+            let deserializedEdges = serializedEdges.map(WebInspector.HeapSnapshotEdgeProxy.deserialize.bind(null, this._proxyObjectId));
+            callback(deserializedNodes, deserializedEdges);
+        });
+    }
+
+    retainers(callback)
+    {
+        WebInspector.HeapSnapshotWorkerProxy.singleton().callMethod(this._proxyObjectId, "retainers", this.id, ({retainers: serializedNodes, edges: serializedEdges}) => {
+            let deserializedNodes = serializedNodes.map(WebInspector.HeapSnapshotNodeProxy.deserialize.bind(null, this._proxyObjectId));
+            let deserializedEdges = serializedEdges.map(WebInspector.HeapSnapshotEdgeProxy.deserialize.bind(null, this._proxyObjectId));
+            callback(deserializedNodes, deserializedEdges);
+        });
+    }
+};
diff --git a/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotProxy.js b/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotProxy.js
new file mode 100644
index 000000000..1c8ed63a7
--- /dev/null
+++ b/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotProxy.js
@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+WebInspector.HeapSnapshotProxy = class HeapSnapshotProxy extends WebInspector.Object
+{
+    constructor(snapshotObjectId, identifier, title, totalSize, totalObjectCount, liveSize, categories)
+    {
+        super();
+
+        this._proxyObjectId = snapshotObjectId;
+
+        this._identifier = identifier;
+        this._title = title;
+        this._totalSize = totalSize;
+        this._totalObjectCount = totalObjectCount;
+        this._liveSize = liveSize;
+        this._categories = Map.fromObject(categories);
+
+        console.assert(!this.invalid);
+
+        if (!WebInspector.HeapSnapshotProxy.ValidSnapshotProxies)
+            WebInspector.HeapSnapshotProxy.ValidSnapshotProxies = [];
+        WebInspector.HeapSnapshotProxy.ValidSnapshotProxies.push(this);
+    }
+
+    // Static
+
+    static deserialize(objectId, serializedSnapshot)
+    {
+        let {identifier, title, totalSize, totalObjectCount, liveSize, categories} = serializedSnapshot;
+        return new WebInspector.HeapSnapshotProxy(objectId, identifier, title, totalSize, totalObjectCount, liveSize, categories);
+    }
+
+    static invalidateSnapshotProxies()
+    {
+        if (!WebInspector.HeapSnapshotProxy.ValidSnapshotProxies)
+            return;
+
+        for (let snapshotProxy of WebInspector.HeapSnapshotProxy.ValidSnapshotProxies)
+            snapshotProxy._invalidate();
+
+        WebInspector.HeapSnapshotProxy.ValidSnapshotProxies = null;
+    }
+
+    // Public
+
+    get proxyObjectId() { return this._proxyObjectId; }
+    get identifier() { return this._identifier; }
+    get title() { return this._title; }
+    get totalSize() { return this._totalSize; }
+    get totalObjectCount() { return this._totalObjectCount; }
+    get liveSize() { return this._liveSize; }
+    get categories() { return this._categories; }
+    get invalid() { return this._proxyObjectId === 0; }
+
+    updateForCollectionEvent(event)
+    {
+        console.assert(!this.invalid);
+        if (!event.data.affectedSnapshots.includes(this._identifier))
+            return;
+
+        this.update(() => {
+            this.dispatchEventToListeners(WebInspector.HeapSnapshotProxy.Event.CollectedNodes, event.data);
+        });
+    }
+
+    allocationBucketCounts(bucketSizes, callback)
+    {
+        console.assert(!this.invalid);
+        WebInspector.HeapSnapshotWorkerProxy.singleton().callMethod(this._proxyObjectId, "allocationBucketCounts", bucketSizes, callback);
+    }
+
+    instancesWithClassName(className, callback)
+    {
+        console.assert(!this.invalid);
+        WebInspector.HeapSnapshotWorkerProxy.singleton().callMethod(this._proxyObjectId, "instancesWithClassName", className, (serializedNodes) => {
+            callback(serializedNodes.map(WebInspector.HeapSnapshotNodeProxy.deserialize.bind(null, this._proxyObjectId)));
+        });
+    }
+
+    update(callback)
+    {
+        console.assert(!this.invalid);
+        WebInspector.HeapSnapshotWorkerProxy.singleton().callMethod(this._proxyObjectId, "update", ({liveSize, categories}) => {
+            this._liveSize = liveSize;
+            this._categories = Map.fromObject(categories);
+            callback();
+        });
+    }
+
+    nodeWithIdentifier(nodeIdentifier, callback)
+    {
+        console.assert(!this.invalid);
+        WebInspector.HeapSnapshotWorkerProxy.singleton().callMethod(this._proxyObjectId, "nodeWithIdentifier", nodeIdentifier, (serializedNode) => {
+            callback(WebInspector.HeapSnapshotNodeProxy.deserialize(this._proxyObjectId, serializedNode));
+        });
+    }
+
+    // Private
+
+    _invalidate()
+    {
+        this._proxyObjectId = 0;
+        this._liveSize = 0;
+
+        this.dispatchEventToListeners(WebInspector.HeapSnapshotProxy.Event.Invalidated);
+    }
+};
+
+WebInspector.HeapSnapshotProxy.Event = {
+    CollectedNodes: "heap-snapshot-proxy-collected-nodes",
+    Invalidated: "heap-snapshot-proxy-invalidated",
+};
diff --git a/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotWorkerProxy.js b/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotWorkerProxy.js
new file mode 100644
index 000000000..c47993c5e
--- /dev/null
+++ b/Source/WebInspectorUI/UserInterface/Proxies/HeapSnapshotWorkerProxy.js
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+WebInspector.HeapSnapshotWorkerProxy = class HeapSnapshotWorkerProxy extends WebInspector.Object
+{
+    constructor()
+    {
+        super();
+
+        this._heapSnapshotWorker = new Worker("Workers/HeapSnapshot/HeapSnapshotWorker.js");
+        this._heapSnapshotWorker.addEventListener("message", this._handleMessage.bind(this));
+
+        this._nextCallId = 1;
+        this._callbacks = new Map;
+
+        WebInspector.Frame.addEventListener(WebInspector.Frame.Event.MainResourceDidChange, this._mainResourceDidChange, this);
+    }
+
+    // Static
+
+    static singleton()
+    {
+        if (!HeapSnapshotWorkerProxy.instance)
+            HeapSnapshotWorkerProxy.instance = new HeapSnapshotWorkerProxy;
+        return HeapSnapshotWorkerProxy.instance;
+    }
+
+    // Actions
+
+    clearSnapshots(callback)
+    {
+        this.performAction("clearSnapshots", callback);
+    }
+
+    createSnapshot(snapshotStringData, callback)
+    {
+        this.performAction("createSnapshot", ...arguments);
+    }
+
+    createSnapshotDiff(objectId1, objectId2, callback)
+    {
+        this.performAction("createSnapshotDiff", ...arguments);
+    }
+
+    // Public
+
+    performAction(actionName)
+    {
+        let callId = this._nextCallId++;
+        let callback = arguments[arguments.length - 1];
+        let actionArguments = Array.prototype.slice.call(arguments, 1, arguments.length - 1);
+
+        console.assert(typeof actionName === "string", "performAction should always have an actionName");
+        console.assert(typeof callback === "function", "performAction should always have a callback");
+
+        this._callbacks.set(callId, callback);
+        this._postMessage({callId, actionName, actionArguments});
+    }
+
+    callMethod(objectId, methodName)
+    {
+        let callId = this._nextCallId++;
+        let callback = arguments[arguments.length - 1];
+        let methodArguments = Array.prototype.slice.call(arguments, 2, arguments.length - 1);
+
+        console.assert(typeof objectId === "number", "callMethod should always have an objectId");
+        console.assert(typeof methodName === "string", "callMethod should always have a methodName");
+        console.assert(typeof callback === "function", "callMethod should always have a callback");
+
+        this._callbacks.set(callId, callback);
+        this._postMessage({callId, objectId, methodName, methodArguments});
+    }
+
+    // Private
+
+    _mainResourceDidChange(event)
+    {
+        if (!event.target.isMainFrame())
+            return;
+
+        this.clearSnapshots(() => {
+            WebInspector.HeapSnapshotProxy.invalidateSnapshotProxies();
+        });
+    }
+
+    _postMessage()
+    {
+        this._heapSnapshotWorker.postMessage(...arguments);
+    }
+
+    _handleMessage(event)
+    {
+        let data = event.data;
+
+        // Error.
+        if (data.error) {
+            console.assert(data.callId);
+            this._callbacks.delete(data.callId);
+            return;
+        }
+
+        // Event.
+        if (data.eventName) {
+            this.dispatchEventToListeners(data.eventName, data.eventData);
+            return;
+        }
+
+        // Action or Method Response.
+        if (data.callId) {
+            let callback = this._callbacks.get(data.callId);
+            this._callbacks.delete(data.callId);
+            callback(data.result);
+            return;
+        }
+
+        console.error("Unexpected HeapSnapshotWorker message", data);
+    }
+};