sync compositor: pass simple gfx types by const ref

content/renderer/android/synchronous_compositor_output_surface.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 CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_OUTPUT_SURFACE_H_
 #define CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_OUTPUT_SURFACE_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 54 matching lines @@
 
   // OutputSurface.
   bool BindToClient(cc::OutputSurfaceClient* surface_client) override;
   void DetachFromClient() override;
   void Reshape(const gfx::Size& size, float scale_factor) override;
   void SwapBuffers(cc::CompositorFrame* frame) override;
   void Invalidate() override;
 
   // Partial SynchronousCompositor API implementation.
   scoped_ptr<cc::CompositorFrame> DemandDrawHw(
-      gfx::Size surface_size,
+      const gfx::Size& surface_size,
       const gfx::Transform& transform,
-      gfx::Rect viewport,
-      gfx::Rect clip,
-      gfx::Rect viewport_rect_for_tile_priority,
+      const gfx::Rect& viewport,
+      const gfx::Rect& clip,
+      const gfx::Rect& viewport_rect_for_tile_priority,
       const gfx::Transform& transform_for_tile_priority);
   void ReturnResources(const cc::CompositorFrameAck& frame_ack);
   scoped_ptr<cc::CompositorFrame> DemandDrawSw(SkCanvas* canvas);
   void SetMemoryPolicy(size_t bytes_limit);
   void SetTreeActivationCallback(const base::Closure& callback);
   void GetMessagesToDeliver(ScopedVector<IPC::Message>* messages);
 
   size_t GetMemoryPolicy() const {
     return memory_policy_.bytes_limit_when_visible;
   }
 
  private:
   class SoftwareDevice;
   friend class SoftwareDevice;
 
   void InvokeComposite(const gfx::Transform& transform,
-                       gfx::Rect viewport,
-                       gfx::Rect clip,
-                       gfx::Rect viewport_rect_for_tile_priority,
-                       gfx::Transform transform_for_tile_priority,
+                       const gfx::Rect& viewport,
+                       const gfx::Rect& clip,
+                       const gfx::Rect& viewport_rect_for_tile_priority,
+                       const gfx::Transform& transform_for_tile_priority,
                        bool hardware_draw);
   bool CalledOnValidThread() const;
 
   const int routing_id_;
   SynchronousCompositorRegistry* const registry_;  // unowned
   bool registered_;
 
   // Not owned.
   SynchronousCompositorOutputSurfaceClient* sync_client_;
 
@@ skipping 14 matching lines @@
   scoped_refptr<FrameSwapMessageQueue> frame_swap_message_queue_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(SynchronousCompositorOutputSurface);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_OUTPUT_SURFACE_H_