Add CCDelegatingRenderer, and corresponding IPCs

cc/CCLayerTreeHostImpl.cpp

Index: cc/CCLayerTreeHostImpl.cpp
diff --git a/cc/CCLayerTreeHostImpl.cpp b/cc/CCLayerTreeHostImpl.cpp
index 23b021fd029781796d107ea182d91f04c0d5ffc0..afb13582714f6ddf1368f8804f5975fc436426f1 100644
--- a/cc/CCLayerTreeHostImpl.cpp
+++ b/cc/CCLayerTreeHostImpl.cpp
@@ -11,6 +11,7 @@
 #include "CCDamageTracker.h"
 #include "CCDebugRectHistory.h"
 #include "CCDelayBasedTimeSource.h"
+#include "CCDelegatingRenderer.h"
 #include "CCFontAtlas.h"
 #include "CCFrameRateCounter.h"
 #include "CCHeadsUpDisplayLayerImpl.h"
@@ -29,6 +30,7 @@
 #include "CCScrollbarLayerImpl.h"
 #include "CCSettings.h"
 #include "CCSingleThreadProxy.h"
+#include "compositor_frame.h"
 #include "TextureUploader.h"
 #include "TraceEvent.h"
 #include <wtf/CurrentTime.h>
@@ -659,6 +661,13 @@ void CCLayerTreeHostImpl::onVSyncParametersChanged(double monotonicTimebase, dou
     m_client->onVSyncParametersChanged(monotonicTimebase, intervalInSeconds);
 }
 
+void CCLayerTreeHostImpl::onSendFrameToParentCompositorAck(const WebKit::WebCompositorFrameAck& webAck)
+{
+    const CompositorFrameAck& ack = static_cast<const CompositorFrameAck&>(webAck);
+    if (m_renderer)
+        m_renderer->onSendFrameToParentCompositorAck(ack);
+}
+
 void CCLayerTreeHostImpl::drawLayers(const FrameData& frame)
 {
     TRACE_EVENT0("cc", "CCLayerTreeHostImpl::drawLayers");
@@ -847,7 +856,9 @@ bool CCLayerTreeHostImpl::initializeRenderer(scoped_ptr<CCGraphicsContext> conte
     if (!resourceProvider)
         return false;
 
-    if (context->context3D())
+    if (context->capabilities().hasParentCompositor)
+        m_renderer = CCDelegatingRenderer::create(this, resourceProvider.get());
+    else if (context->context3D())
         m_renderer = CCRendererGL::create(this, resourceProvider.get());
     else if (context->softwareDevice())
         m_renderer = CCRendererSoftware::create(this, resourceProvider.get(), context->softwareDevice());