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..a581e4da417fcc730afc6afa07e0f1422a88d5b5 100644
--- a/components/view_manager/public/interfaces/compositor_frame.mojom
+++ b/components/view_manager/public/interfaces/compositor_frame.mojom
@@ -50,3 +50,13 @@ 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) => ();
+};