Revert of Revert of Reland factor out window proxy management portions of ScriptController.

Source/bindings/core/v8/WindowProxyManager.h

Index: Source/bindings/core/v8/WindowProxyManager.h
diff --git a/Source/bindings/core/v8/WindowProxyManager.h b/Source/bindings/core/v8/WindowProxyManager.h
new file mode 100644
index 0000000000000000000000000000000000000000..83b6f32f996f59631dbce5089c3b592db660db0f
--- /dev/null
+++ b/Source/bindings/core/v8/WindowProxyManager.h
@@ -0,0 +1,56 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef WindowProxyManager_h
+#define WindowProxyManager_h
+
+#include "platform/heap/Handle.h"
+#include "wtf/Vector.h"
+#include <utility>
+#include <v8.h>
+
+namespace blink {
+
+class DOMWrapperWorld;
+class Frame;
+class ScriptState;
+class SecurityOrigin;
+class WindowProxy;
+
+class WindowProxyManager final : public NoBaseWillBeGarbageCollectedFinalized<WindowProxyManager> {
+public:
+    static PassOwnPtrWillBeRawPtr<WindowProxyManager> create(Frame*);
+
+    ~WindowProxyManager();
+    void trace(Visitor*);
+
+    Frame* frame() const { return m_frame.get(); }
+    v8::Isolate* isolate() const { return m_isolate; }
+    WindowProxy* mainWorldProxy() const { return m_windowProxy.get(); }
+
+    WindowProxy* windowProxy(DOMWrapperWorld&);
+
+    void clearForClose();
+    void clearForNavigation();
+
+    // For devtools:
+    WindowProxy* existingWindowProxy(DOMWrapperWorld&);
+    void collectIsolatedContexts(Vector<std::pair<ScriptState*, SecurityOrigin*>>&);
+    void setWorldDebugId(int worldId, int debuggerId);
+
+private:
+    typedef WillBeHeapHashMap<int, OwnPtrWillBeMember<WindowProxy> > IsolatedWorldMap;
+
+    explicit WindowProxyManager(Frame*);
+
+    RawPtrWillBeMember<Frame> m_frame;
+    v8::Isolate* const m_isolate;
+
+    const OwnPtrWillBeMember<WindowProxy> m_windowProxy;
+    IsolatedWorldMap m_isolatedWorlds;
+};
+
+} // namespace blink
+
+#endif // WindowProxyManager_h