Send compositor frame IPC with metadata.

cc/renderer.h

Index: cc/renderer.h
diff --git a/cc/renderer.h b/cc/renderer.h
index 2adf7c02998574acdd32e7395fc45217ffbbefdd..36d6791edecc6d32e1154cc23dc65dd96033d4c9 100644
--- a/cc/renderer.h
+++ b/cc/renderer.h
@@ -14,6 +14,7 @@
 namespace cc {
 
 class CompositorFrameAck;
+class CompositorFrameMetadata;
 class ScopedResource;
 
 class CC_EXPORT RendererClient {
@@ -27,6 +28,7 @@ public:
     virtual void enforceManagedMemoryPolicy(const ManagedMemoryPolicy& policy) = 0;
     virtual bool hasImplThread() const = 0;
     virtual bool shouldClearRootRenderPass() const = 0;
+    virtual CompositorFrameMetadata makeCompositorFrameMetadata() const = 0;
 protected:
     virtual ~RendererClient() { }
 };