Introduce AnimationWorkletProxyClient and necessary plumbing to get it in worklet messaging proxy.

third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp

 /*
  * Copyright (C) 2014 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 40 matching lines @@
 #include "core/page/Page.h"
 #include "core/page/PointerLockController.h"
 #include "platform/KeyboardCodes.h"
 #include "platform/WebFrameScheduler.h"
 #include "platform/animation/CompositorAnimationHost.h"
 #include "platform/graphics/CompositorMutatorClient.h"
 #include "public/web/WebAutofillClient.h"
 #include "public/web/WebPlugin.h"
 #include "public/web/WebRange.h"
 #include "public/web/WebWidgetClient.h"
+#include "web/AnimationWorkletProxyClientImpl.h"
 #include "web/CompositionUnderlineVectorBuilder.h"
 #include "web/CompositorMutatorImpl.h"
-#include "web/CompositorProxyClientImpl.h"
+#include "web/CompositorWorkerProxyClientImpl.h"
 #include "web/ContextMenuAllowedScope.h"
 #include "web/InspectorOverlay.h"
 #include "web/PageOverlay.h"
 #include "web/WebDevToolsAgentImpl.h"
 #include "web/WebInputEventConversion.h"
 #include "web/WebInputMethodControllerImpl.h"
 #include "web/WebLocalFrameImpl.h"
 #include "web/WebPluginContainerImpl.h"
 #include "web/WebRemoteFrameImpl.h"
 #include "web/WebViewFrameWidget.h"
@@ skipping 335 matching lines @@
 
 void WebFrameWidgetImpl::scheduleAnimation() {
   if (m_layerTreeView) {
     m_layerTreeView->setNeedsBeginFrame();
     return;
   }
   if (m_client)
     m_client->scheduleAnimation();
 }
 
-CompositorProxyClient* WebFrameWidgetImpl::createCompositorProxyClient() {
+CompositorProxyClient* WebFrameWidgetImpl::createCompositorProxyClient(
+    CompositorProxyClient::Type type) {
   if (!m_mutator) {
     std::unique_ptr<CompositorMutatorClient> mutatorClient =
         CompositorMutatorImpl::createClient();
     m_mutator = static_cast<CompositorMutatorImpl*>(mutatorClient->mutator());
     m_layerTreeView->setMutatorClient(std::move(mutatorClient));
   }
-  return new CompositorProxyClientImpl(m_mutator);
+
+  switch (type) {
+    case CompositorProxyClient::kWorkerClient:

[dcheng, 2017/01/24 22:56:26]

Internally, we can just share |m_mutator| initialization and construct the
appropriate object depending on which overload is called.

+      return new CompositorWorkerProxyClientImpl(m_mutator);
+    case CompositorProxyClient::kWorkletClient:
+      return new AnimationWorkletProxyClientImpl(m_mutator);
+  }
+
+  NOTREACHED() << "Unexpected CompositorProxyClient::Type: " << type;
+  return nullptr;
 }
 
 void WebFrameWidgetImpl::applyViewportDeltas(
     const WebFloatSize& visualViewportDelta,
     const WebFloatSize& mainFrameDelta,
     const WebFloatSize& elasticOverscrollDelta,
     float pageScaleDelta,
     float browserControlsDelta) {
   // FIXME: To be implemented.
 }
@@ skipping 695 matching lines @@
   return nullptr;
 }
 
 LocalFrame* WebFrameWidgetImpl::focusedLocalFrameAvailableForIme() const {
   if (!m_imeAcceptEvents)
     return nullptr;
   return focusedLocalFrameInWidget();
 }
 
 }  // namespace blink