GpuDisplayCompositorFrameSink => GpuRootCompositorFrameSink

cc/ipc/display_compositor.mojom

 // Copyright 2016 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 cc.mojom;
 
 import "cc/ipc/frame_sink_id.mojom";
 import "cc/ipc/local_surface_id.mojom";
 import "cc/ipc/mojo_compositor_frame_sink.mojom";
 import "cc/ipc/surface_id.mojom";
@@ skipping 22 matching lines @@
 // MojoCompositorFrameSink interface, and implement a
 // MojoCompositorFrameSinkClient interface. The display compositor host
 // holds one or more root CompositorFrameSinks that are tied to a valid
 // |surface_handle|. All other CompositorFrameSinks are offscreen. FrameSinkIds
 // are fixed for a given client and are determined ahead of time. Thus, a client
 // will typically simply request a CompositorFrameSink from the display
 // compositor host which will forward the request to the display compositor.
 interface DisplayCompositor {
   // Create a CompositorFrameSink for a privileged client (e.g. WindowServer).
   // This is only used by privileged clients. The client can call methods that
-  // talks to the cc::Display (e.g. ResizeDisplay(), SetDisplayVisible(), etc)
-  CreateDisplayCompositorFrameSink(
+  // talks to the Display (e.g. ResizeDisplay(), SetDisplayVisible(), etc)
+  CreateRootCompositorFrameSink(
       cc.mojom.FrameSinkId frame_sink_id,
       gpu.mojom.SurfaceHandle widget,
       associated cc.mojom.MojoCompositorFrameSink& compositor_frame_sink,
       cc.mojom.MojoCompositorFrameSinkPrivate& compositor_frame_sink_private,
       cc.mojom.MojoCompositorFrameSinkClient compositor_frame_sink_client,
       associated DisplayPrivate& display_private);
 
-  // CreateOffscreenCompositorFrameSink is used by unprivileged clients.
-  // An off screen CompositorFrameSink only submits frames to a buffer instead
-  // of a display.
-  CreateOffscreenCompositorFrameSink(
+  // CreateCompositorFrameSink is used by unprivileged clients.
+  // This CompositorFrameSink is not a root, and has to be parented by another
+  // CompositorFrameSink in order to appear on screen.
+  CreateCompositorFrameSink(
       cc.mojom.FrameSinkId frame_sink_id,
       cc.mojom.MojoCompositorFrameSink& compositor_frame_sink,
       cc.mojom.MojoCompositorFrameSinkPrivate& compositor_frame_sink_private,
       cc.mojom.MojoCompositorFrameSinkClient compositor_frame_sink_client);
 };
 
 // The DisplayCompositorClient interface is implemented by the Display
 // Compositor Host, a stable, and privileged peer service to the display
 // compositor. The display compositor host is either the browser process in
 // Chrome or the window server process.
 interface DisplayCompositorClient {
   // Called by the display compositor immediately upon receiving a
   // CompositorFrame with a new SurfaceId for the first time.
   OnSurfaceCreated(SurfaceInfo surface_info);
 };