Prepare CompositorFrameSinkSupport To Be Used By DirectCompositorFrameSink

cc/surfaces/compositor_frame_sink_support.h

Index: cc/surfaces/compositor_frame_sink_support.h
diff --git a/cc/surfaces/compositor_frame_sink_support.h b/cc/surfaces/compositor_frame_sink_support.h
index 2779a1213dee3b6b24be4cfc6f627e7bf3a1b980..7e10800b868239033f302630be47d769b671c3f7 100644
--- a/cc/surfaces/compositor_frame_sink_support.h
+++ b/cc/surfaces/compositor_frame_sink_support.h
@@ -30,7 +30,9 @@ class CC_SURFACES_EXPORT CompositorFrameSinkSupport
   CompositorFrameSinkSupport(CompositorFrameSinkSupportClient* client,
                              SurfaceManager* surface_manager,
                              const FrameSinkId& frame_sink_id,
-                             bool submits_to_display_compositor);
+                             bool is_root,
+                             bool handles_frame_sink_id_invalidation,
+                             bool needs_sync_points);
 
   ~CompositorFrameSinkSupport() override;
 
@@ -115,7 +117,19 @@ class CC_SURFACES_EXPORT CompositorFrameSinkSupport
   // The set of BeginFrame children of this CompositorFrameSink.
   std::unordered_set<FrameSinkId, FrameSinkIdHash> child_frame_sinks_;
 
-  const bool submits_to_display_compositor_;
+  const bool is_root_;
+
+  // TODO(staraz): Remove this flag once ui::Compositor no longer needs to call
+  // RegisterFrameSinkId().
+  // A surfaceSequence's validity is bound to the lifetime of the parent
+  // FrameSink that created it. We track the lifetime of FrameSinks through
+  // RegisterFrameSinkId and InvalidateFrameSinkId. During startup and GPU
+  // restart, a SurfaceSequence created by the top most layer compositor may be
+  // used prior to the creation of the associated CompositorFrameSinkSupport.
+  // CompositorFrameSinkSupport is created asynchronously when a new GPU channel
+  // is established. Once we switch to SurfaceReferences, this ordering concern
+  // goes away and we can remove this bool.
+  const bool handles_frame_sink_id_invalidation_;
 
   base::WeakPtrFactory<CompositorFrameSinkSupport> weak_factory_;