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diff --git a/Source/WebKit2/UIProcess/WebInspectorUtilities.cpp b/Source/WebKit2/UIProcess/WebInspectorUtilities.cpp
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+++ b/Source/WebKit2/UIProcess/WebInspectorUtilities.cpp
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+/*
+ * 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.
+ */
+
+#include "config.h"
+#include "WebInspectorUtilities.h"
+
+#include "APIProcessPoolConfiguration.h"
+#include "WebPageGroup.h"
+#include "WebPageProxy.h"
+#include "WebProcessPool.h"
+#include "WebProcessProxy.h"
+#include <wtf/HashMap.h>
+#include <wtf/NeverDestroyed.h>
+
+namespace WebKit {
+
+typedef HashMap<WebPageProxy*, unsigned> PageLevelMap;
+
+static PageLevelMap& pageLevelMap()
+{
+    static NeverDestroyed<PageLevelMap> map;
+    return map;
+}
+
+unsigned inspectorLevelForPage(WebPageProxy* page)
+{
+    if (page) {
+        auto findResult = pageLevelMap().find(page);
+        if (findResult != pageLevelMap().end())
+            return findResult->value + 1;
+    }
+
+    return 1;
+}
+
+String inspectorPageGroupIdentifierForPage(WebPageProxy* page)
+{
+    return String::format("__WebInspectorPageGroupLevel%u__", inspectorLevelForPage(page));
+}
+
+void trackInspectorPage(WebPageProxy* page)
+{
+    pageLevelMap().set(page, inspectorLevelForPage(page));
+}
+
+void untrackInspectorPage(WebPageProxy* page)
+{
+    pageLevelMap().remove(page);
+}
+
+static WebProcessPool* s_mainInspectorProcessPool;
+static WebProcessPool* s_nestedInspectorProcessPool;
+
+WebProcessPool& inspectorProcessPool(unsigned inspectionLevel)
+{
+    // Having our own process pool removes us from the main process pool and
+    // guarantees no process sharing for our user interface.
+    WebProcessPool*& pool = (inspectionLevel == 1) ? s_mainInspectorProcessPool : s_nestedInspectorProcessPool;
+    if (!pool) {
+        auto configuration = API::ProcessPoolConfiguration::createWithLegacyOptions();
+        pool = &WebProcessPool::create(configuration.get()).leakRef();
+    }
+    return *pool;
+}
+
+bool isInspectorProcessPool(WebProcessPool& processPool)
+{
+    return (s_mainInspectorProcessPool && s_mainInspectorProcessPool == &processPool)
+        || (s_nestedInspectorProcessPool && s_nestedInspectorProcessPool == &processPool);
+}
+
+bool isInspectorPage(WebPageProxy& webPage)
+{
+    return pageLevelMap().contains(&webPage);
+}
+
+} // namespace WebKit