Cleanup RemotePlatformLayer when disconnecting RemoteFrame.

Source/core/frame/RemoteFrame.h

 // Copyright 2014 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 RemoteFrame_h
 #define RemoteFrame_h
 
 #include "core/dom/RemoteSecurityContext.h"
 #include "core/frame/Frame.h"
 
 namespace blink {
 
 class Event;
 class RemoteDOMWindow;
 class RemoteFrameClient;
 class RemoteFrameView;
+class WebLayer;
 
 class RemoteFrame: public Frame {
 public:
     static PassRefPtrWillBeRawPtr<RemoteFrame> create(RemoteFrameClient*, FrameHost*, FrameOwner*);
 
     virtual ~RemoteFrame();
 
     // Frame overrides:
     void trace(Visitor*) override;
-    virtual bool isRemoteFrame() const override { return true; }
-    virtual DOMWindow* domWindow() const override;
-    virtual void navigate(Document& originDocument, const KURL&, bool lockBackForwardList) override;
-    virtual void reload(ReloadPolicy, ClientRedirectPolicy) override;
-    virtual void detach() override;
-    virtual RemoteSecurityContext* securityContext() const override;
+    bool isRemoteFrame() const override { return true; }
+    DOMWindow* domWindow() const override;
+    void navigate(Document& originDocument, const KURL&, bool lockBackForwardList) override;
+    void reload(ReloadPolicy, ClientRedirectPolicy) override;
+    void detach() override;
+    RemoteSecurityContext* securityContext() const override;
     void printNavigationErrorMessage(const Frame&, const char* reason) { }
+    void disconnectOwnerElement() override;
 
     // FIXME: Remove this method once we have input routing in the browser
     // process. See http://crbug.com/339659.
     void forwardInputEvent(Event*);
 
+    void setRemotePlatformLayer(WebLayer*);
+    WebLayer* remotePlatformLayer() const { return m_remotePlatformLayer; }
+
     void setView(PassRefPtrWillBeRawPtr<RemoteFrameView>);
     void createView();
 
     RemoteFrameView* view() const;
 
 
 private:
     RemoteFrame(RemoteFrameClient*, FrameHost*, FrameOwner*);
 
     RemoteFrameClient* remoteFrameClient() const;
 
     RefPtrWillBeMember<RemoteFrameView> m_view;
     RefPtr<RemoteSecurityContext> m_securityContext;
     RefPtrWillBeMember<RemoteDOMWindow> m_domWindow;
+
+    WebLayer* m_remotePlatformLayer;
 };
 
 inline RemoteFrameView* RemoteFrame::view() const
 {
     return m_view.get();
 }
 
 DEFINE_TYPE_CASTS(RemoteFrame, Frame, remoteFrame, remoteFrame->isRemoteFrame(), remoteFrame.isRemoteFrame());
 
 } // namespace blink
 
 #endif // RemoteFrame_h