Implement service-side surface synchronization

cc/output/compositor_frame_metadata.h

Index: cc/output/compositor_frame_metadata.h
diff --git a/cc/output/compositor_frame_metadata.h b/cc/output/compositor_frame_metadata.h
index 206a4a050d0d8ddbae3278b721918aeebdd8fe40..e383e5069dcd82c0f9c4a044fd4f38d6eabc4969 100644
--- a/cc/output/compositor_frame_metadata.h
+++ b/cc/output/compositor_frame_metadata.h
@@ -78,6 +78,10 @@ class CC_EXPORT CompositorFrameMetadata {
   // This is the set of Surfaces that are referenced by this frame.
   std::vector<SurfaceId> referenced_surfaces;
 
+  // This indicates whether this CompositorFrame can be activated before
+  // dependencies have been resolved.
+  bool can_activate_before_dependencies = true;
+
  private:
   CompositorFrameMetadata(const CompositorFrameMetadata& other);
   CompositorFrameMetadata operator=(const CompositorFrameMetadata&) = delete;