Mandoline: Allow submitting CompositorFrames directly to mojo::Views

components/view_manager/public/interfaces/compositor_frame.mojom

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 module mojo;
 
 import "ui/mojo/geometry/geometry.mojom";
 import "components/view_manager/public/interfaces/quads.mojom";
 
 enum ResourceFormat {
   RGBA_8888,
   RGBA_4444,
   BGRA_8888,
   ALPHA_8,
   LUMINANCE_8,
   RGB_565,
   ETC1,
 };
 
 // See src/cc/resources/returned_resource.h.
 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;
 };
 
 // See src/gpu/command_buffer/common/mailbox_holder.h.
 struct MailboxHolder {
   Mailbox mailbox;
   uint32 texture_target;
   uint32 sync_point;
@@ skipping 13 matching lines @@
   MailboxHolder mailbox_holder;
   bool is_repeated;
   bool is_software;
 };
 
 // See src/cc/output/compositor_frame.h.
 struct CompositorFrame {
   array<TransferableResource> resources;
   array<Pass> passes;
 };
+
+// A Surface 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 Surface {
+  // 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) => ();
+};
+
+interface SurfaceClient {
+  ReturnResources(array<ReturnedResource> resources);
+};