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

third_party/WebKit/Source/web/WebViewImpl.cpp

Index: third_party/WebKit/Source/web/WebViewImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebViewImpl.cpp b/third_party/WebKit/Source/web/WebViewImpl.cpp
index 358c045533e74111a3bb3a10c57126db939e78cf..7c72e41e543f04183bf89b5607973d7a9f42074a 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.cpp
+++ b/third_party/WebKit/Source/web/WebViewImpl.cpp
@@ -113,6 +113,7 @@
 #include "platform/fonts/FontCache.h"
 #include "platform/graphics/Color.h"
 #include "platform/graphics/CompositorFactory.h"
+#include "platform/graphics/CompositorMutatorClient.h"
 #include "platform/graphics/FirstPaintInvalidationTracking.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/Image.h"
@@ -152,6 +153,7 @@
 #include "public/web/WebViewClient.h"
 #include "public/web/WebWindowFeatures.h"
 #include "web/CompositionUnderlineVectorBuilder.h"
+#include "web/CompositorMutatorImpl.h"
 #include "web/ContextFeaturesClientImpl.h"
 #include "web/ContextMenuAllowedScope.h"
 #include "web/DatabaseClientImpl.h"
@@ -4545,6 +4547,15 @@ void WebViewImpl::forceNextDrawingBufferCreationToFail()
     DrawingBuffer::forceNextDrawingBufferCreationToFail();
 }
 
+CompositorProxyClient* WebViewImpl::createCompositorProxyClient()
+{
+    if (!m_mutator.get()) {

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

nit: "if (!m_mutator) {"

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

Done.

+        m_mutator = CompositorMutatorImpl::create();
+        m_layerTreeView->setMutatorClient(m_mutator->client());
+    }
+    return m_mutator->createCompositorProxyClient();
+}
+
 void WebViewImpl::updatePageOverlays()
 {
     if (m_pageColorOverlay)