Plumb overlay processing into DirectRenderer.

gpu/command_buffer/client/context_support.h

 // Copyright 2013 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.
 
 #ifndef GPU_COMMAND_BUFFER_CLIENT_CONTEXT_SUPPORT_H_
 #define GPU_COMMAND_BUFFER_CLIENT_CONTEXT_SUPPORT_H_
 
 #include "base/callback.h"
 #include "ui/gfx/rect.h"
 
@@ skipping 15 matching lines @@
   virtual void SetSurfaceVisible(bool visible) = 0;
 
   virtual void SendManagedMemoryStats(const ManagedMemoryStats& stats) = 0;
 
   virtual void Swap() = 0;
   virtual void PartialSwapBuffers(const gfx::Rect& sub_buffer) = 0;
 
   virtual void SetSwapBuffersCompleteCallback(
       const base::Closure& callback) = 0;
 
+  // Schedule a texture to be presented as an overlay synchronously with the
+  // primary surface during the next buffer swap.

[piman, 2014/03/26 03:43:33]

You may want to mention that this is not stateful, i.e. needs to be reissued
before the next swap?

At least I gather that's what we're planning to have given the rest of the code.

+  virtual void ScheduleOverlayPlane(int plane_z_order,
+                                    unsigned plane_transform,
+                                    unsigned overlay_texture_id,
+                                    const gfx::Rect& display_bounds,
+                                    gfx::RectF crop_rect) = 0;
+
  protected:
   ContextSupport() {}
   virtual ~ContextSupport() {}
 };
 
 }
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_CONTEXT_SUPPORT_H_