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diff --git a/Source/WebCore/inspector/WebHeapAgent.cpp b/Source/WebCore/inspector/WebHeapAgent.cpp
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+++ b/Source/WebCore/inspector/WebHeapAgent.cpp
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+/*
+ * Copyright (C) 2015-2017 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.
+ */
+
+#include "config.h"
+#include "WebHeapAgent.h"
+
+#include <wtf/RunLoop.h>
+
+using namespace Inspector;
+
+namespace WebCore {
+
+struct GarbageCollectionData {
+    Inspector::Protocol::Heap::GarbageCollection::Type type;
+    double startTime;
+    double endTime;
+};
+
+class SendGarbageCollectionEventsTask {
+public:
+    SendGarbageCollectionEventsTask(WebHeapAgent&);
+    void addGarbageCollection(GarbageCollectionData&&);
+    void reset();
+private:
+    void timerFired();
+
+    WebHeapAgent& m_agent;
+    Vector<GarbageCollectionData> m_collections;
+    RunLoop::Timer<SendGarbageCollectionEventsTask> m_timer;
+    Lock m_mutex;
+};
+
+SendGarbageCollectionEventsTask::SendGarbageCollectionEventsTask(WebHeapAgent& agent)
+    : m_agent(agent)
+    , m_timer(RunLoop::main(), this, &SendGarbageCollectionEventsTask::timerFired)
+{
+}
+
+void SendGarbageCollectionEventsTask::addGarbageCollection(GarbageCollectionData&& collection)
+{
+    {
+        std::lock_guard<Lock> lock(m_mutex);
+        m_collections.append(WTFMove(collection));
+    }
+
+    if (!m_timer.isActive())
+        m_timer.startOneShot(0);
+}
+
+void SendGarbageCollectionEventsTask::reset()
+{
+    {
+        std::lock_guard<Lock> lock(m_mutex);
+        m_collections.clear();
+    }
+
+    m_timer.stop();
+}
+
+void SendGarbageCollectionEventsTask::timerFired()
+{
+    Vector<GarbageCollectionData> collectionsToSend;
+
+    {
+        std::lock_guard<Lock> lock(m_mutex);
+        m_collections.swap(collectionsToSend);
+    }
+
+    m_agent.dispatchGarbageCollectionEventsAfterDelay(WTFMove(collectionsToSend));
+}
+
+WebHeapAgent::WebHeapAgent(Inspector::AgentContext& context)
+    : InspectorHeapAgent(context)
+    , m_sendGarbageCollectionEventsTask(std::make_unique<SendGarbageCollectionEventsTask>(*this))
+{
+}
+
+WebHeapAgent::~WebHeapAgent()
+{
+    m_sendGarbageCollectionEventsTask->reset();
+}
+
+void WebHeapAgent::disable(ErrorString& errorString)
+{
+    m_sendGarbageCollectionEventsTask->reset();
+
+    InspectorHeapAgent::disable(errorString);
+}
+
+void WebHeapAgent::dispatchGarbageCollectedEvent(Inspector::Protocol::Heap::GarbageCollection::Type type, double startTime, double endTime)
+{
+    // Dispatch the event asynchronously because this method may be
+    // called between collection and sweeping and we don't want to
+    // create unexpected JavaScript allocations that the Sweeper does
+    // not expect to encounter. JavaScript allocations could happen
+    // with WebKitLegacy's in process inspector which shares the same
+    // VM as the inspected page.
+
+    GarbageCollectionData data = {type, startTime, endTime};
+    m_sendGarbageCollectionEventsTask->addGarbageCollection(WTFMove(data));
+}
+
+void WebHeapAgent::dispatchGarbageCollectionEventsAfterDelay(Vector<GarbageCollectionData>&& collections)
+{
+    for (auto& collection : collections)
+        InspectorHeapAgent::dispatchGarbageCollectedEvent(collection.type, collection.startTime, collection.endTime);
+}
+
+} // namespace WebCore