Mandoline: Allow submitting CompositorFrames directly to mojo::Views

components/view_manager/public/interfaces/compositor_frame.mojom

Index: components/view_manager/public/interfaces/compositor_frame.mojom
diff --git a/components/view_manager/public/interfaces/compositor_frame.mojom b/components/view_manager/public/interfaces/compositor_frame.mojom
index 314aee5de56fa6e293a304544e30420042f47259..b63ad2c28f86ec19b67ff3ccb56309758c8d20ff 100644
--- a/components/view_manager/public/interfaces/compositor_frame.mojom
+++ b/components/view_manager/public/interfaces/compositor_frame.mojom
@@ -17,6 +17,17 @@ enum ResourceFormat {
   ETC1,
 };
 
+struct ReturnedResource {
+  uint32 id;
+  uint32 sync_point;
+  int32 count;
+  bool lost;
+};
+
+interface ResourceReturner {
+  ReturnResources(array<ReturnedResource> resources);
+};
+
 // See src/gpu/command_buffer/common/mailbox.h.
 struct Mailbox {
   array<int8, 64> name;
@@ -50,3 +61,13 @@ struct CompositorFrame {
   array<TransferableResource> resources;
   array<Pass> passes;
 };
+
+// CompositorFrameReceiver is an interface for receiving CompositorFrame
+// structs. This is a separate interface to allow CompositorFrames to be
+// delivered from supplementary (not main) threads of a mojo app.
+interface CompositorFrameReceiver {
+  // After the submitted frame is drawn for the first time, the receiver will
+  // respond to the SubmitFrame message. Clients should use this acknowledgement
+  // to ratelimit frame submissions.
+  SubmitCompositorFrame(CompositorFrame frame) => ();
+};