[compositorworker] Register compositor proxies with proxy client

third_party/WebKit/Source/core/dom/CompositorProxyClient.h

 // Copyright 2016 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 CompositorProxyClient_h
 #define CompositorProxyClient_h
 
 #include "core/CoreExport.h"
 #include "core/workers/WorkerClients.h"
 #include "wtf/Noncopyable.h"
@@ skipping 12 matching lines @@
     WTF_MAKE_NONCOPYABLE(CompositorProxyClient);
 
 public:
     CompositorProxyClient() {}
 
     static CompositorProxyClient* from(WorkerClients*);
     static const char* supplementName();
 
     virtual void setGlobalScope(WorkerGlobalScope*) = 0;
     virtual void requestAnimationFrame() = 0;
+    virtual void registerCompositorProxy(CompositorProxy*) = 0;
+    // It is not guaranteed to receive an unregister call for every registered
+    // proxy. In fact we only receive one when a proxy is explicitly
+    // disconnected otherwise we rely on oilpan collection process to remove the
+    // weak reference to the proxy.
+    virtual void unregisterCompositorProxy(CompositorProxy*) = 0;
 };
 
 CORE_EXPORT void provideCompositorProxyClientTo(WorkerClients*, CompositorProxyClient*);
 
 } // namespace blink
 
 #endif // CompositorProxyClient_h