Add Satisfy() and Require() to MojoCompositorFrameSink

cc/ipc/mojo_compositor_frame_sink.mojom

Index: cc/ipc/mojo_compositor_frame_sink.mojom
diff --git a/cc/ipc/mojo_compositor_frame_sink.mojom b/cc/ipc/mojo_compositor_frame_sink.mojom
index 5c6d77e38e494c907a98115ce8aa65301b3db908..bd45ec4944c3d0d1efaa0669b5e5eb2793db688e 100644
--- a/cc/ipc/mojo_compositor_frame_sink.mojom
+++ b/cc/ipc/mojo_compositor_frame_sink.mojom
@@ -9,6 +9,7 @@ import "cc/ipc/compositor_frame.mojom";
 import "cc/ipc/frame_sink_id.mojom";
 import "cc/ipc/local_frame_id.mojom";
 import "cc/ipc/returned_resource.mojom";
+import "cc/ipc/surface_sequence.mojom";
 
 // A MojoCompositorFrameSink is an interface for receiving CompositorFrame
 // structs. A CompositorFrame contains the complete output meant for display.
@@ -35,6 +36,14 @@ interface MojoCompositorFrameSink {
   // that its resources gets returned in time.
   EvictFrame();
 
+  // Add the provided |sequence| as a destruction dependency of the

[Fady Samuel, 2016/12/05 20:03:09]

Please add a TODO here to delete these once surface references are ready.

[Alex Z., 2016/12/05 20:07:49]

Done.

+  // surface associated with the provided |local_frame_id|.
+  Require(cc.mojom.LocalFrameId local_frame_id,
+          cc.mojom.SurfaceSequence sequence);
+
+  // Mark the sequence as satisfied and garbage collect surfaces.
+  Satisfy(cc.mojom.SurfaceSequence sequence);
+
   // TODO(fsamuel): ReadbackBitmap API would be useful here.
 };