content: Improve thread priority for raster threads.

cc/output/output_surface.h

 // Copyright 2012 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 CC_OUTPUT_OUTPUT_SURFACE_H_
 #define CC_OUTPUT_OUTPUT_SURFACE_H_
 
 #include <deque>
 
 #include "base/macros.h"
@@ skipping 119 matching lines @@
   virtual void BindFramebuffer();
 
   // The implementation may destroy or steal the contents of the CompositorFrame
   // passed in (though it will not take ownership of the CompositorFrame
   // itself). For successful swaps, the implementation must call
   // OutputSurfaceClient::DidSwapBuffers() and eventually
   // DidSwapBuffersComplete().
   virtual void SwapBuffers(CompositorFrame* frame) = 0;
   virtual void OnSwapBuffersComplete();
 
-  // Notifies frame-rate smoothness preference. If true, all non-critical
-  // processing should be stopped, or lowered in priority.
-  virtual void UpdateSmoothnessTakesPriority(bool prefer_smoothness) {}
-
   bool HasClient() { return !!client_; }
 
   // Get the class capable of informing cc of hardware overlay capability.
   virtual OverlayCandidateValidator* GetOverlayCandidateValidator() const;
 
   // Returns true if a main image overlay plane should be scheduled.
   virtual bool IsDisplayedAsOverlayPlane() const;
 
   // Get the texture for the main image's overlay.
   virtual unsigned GetOverlayTextureId() const;
@@ skipping 44 matching lines @@
   bool external_stencil_test_enabled_;
 
   base::WeakPtrFactory<OutputSurface> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OutputSurface);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OUTPUT_SURFACE_H_