compositor-worker: Initialize CW machinery plumbing to compositor and fire CW rAF callbacks.

third_party/WebKit/public/web/WebView.h

 /*
  * Copyright (C) 2009, 2010, 2011, 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 26 matching lines @@
 #include "../platform/WebFocusType.h"
 #include "../platform/WebPageVisibilityState.h"
 #include "../platform/WebString.h"
 #include "../platform/WebVector.h"
 #include "WebHistoryCommitType.h"
 #include "WebHistoryItem.h"
 #include "WebWidget.h"
 
 namespace blink {
 
+class CompositorProxyClient;
 class WebAXObject;
 class WebAutofillClient;
 class WebCompositedDisplayList;
 class WebCredentialManagerClient;
 class WebDragData;
 class WebFrame;
 class WebHitTestResult;
 class WebLocalFrame;
 class WebPageImportanceSignals;
 class WebPageOverlay;
@@ skipping 416 matching lines @@
     // Testing functionality for TestRunner ---------------------------------
 
     // Force the webgl context to fail so that webglcontextcreationerror
     // event gets generated/tested.
     virtual void forceNextWebGLContextCreationToFail() = 0;
 
     // Force the drawing buffer used by webgl contexts to fail so that the webgl
     // context's ability to deal with that failure gracefully can be tested.
     virtual void forceNextDrawingBufferCreationToFail() = 0;
 
+    // CompositorWorker -----------------------------------------------------
+
+    // Initializes the compositor worker machinery and ensures that it is
+    // plumbed to the compositor.
+    virtual CompositorProxyClient* createCompositorProxyClient() = 0;

[jbroman, 2016/04/20 19:24:51]

This is not called outside of Source/web/ (AFIACT its only caller is
ChromeClientImpl), so it need to be part of the Blink public API. It can just be
a non-virtual method on WebViewImpl.

[flackr, 2016/04/25 14:06:28]

Good catch, this doesn't need to be virtual at all. Done.

+
 protected:
     ~WebView() {}
 };
 
 } // namespace blink
 
 #endif