Send compositor frame IPC with metadata.

cc/renderer.h

Index: cc/renderer.h
diff --git a/cc/renderer.h b/cc/renderer.h
index 981679cc08826f942e6e2a17d8ba421f9a64aaf1..f5fe839f81388030e4e7c78e9fb6043ad18e6cff 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 {
@@ -26,6 +27,7 @@ public:
     virtual void setManagedMemoryPolicy(const ManagedMemoryPolicy& policy) = 0;
     virtual void enforceManagedMemoryPolicy(const ManagedMemoryPolicy& policy) = 0;
     virtual bool hasImplThread() const = 0;
+    virtual CompositorFrameMetadata makeCompositorFrameMetadata() const = 0;
 protected:
     virtual ~RendererClient() { }
 };