[#2] Pass gfx structs by const ref (gfx::Rect, gfx::RectF)

gpu/command_buffer/client/gles2_implementation.cc

 // Copyright (c) 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.
 
 // A class to emulate GLES2 over command buffers.
 
 #include "gpu/command_buffer/client/gles2_implementation.h"
 
 #include <algorithm>
 #include <map>
@@ skipping 2763 matching lines @@
   CheckGLError();
 }
 
 void GLES2Implementation::Swap() {
   SwapBuffers();
   gpu_control_->Echo(
       base::Bind(&GLES2Implementation::OnSwapBuffersComplete,
                  weak_ptr_factory_.GetWeakPtr()));
 }
 
-void GLES2Implementation::PartialSwapBuffers(gfx::Rect sub_buffer) {
+void GLES2Implementation::PartialSwapBuffers(const gfx::Rect& sub_buffer) {
   PostSubBufferCHROMIUM(sub_buffer.x(),
                         sub_buffer.y(),
                         sub_buffer.width(),
                         sub_buffer.height());
   gpu_control_->Echo(base::Bind(&GLES2Implementation::OnSwapBuffersComplete,
                                 weak_ptr_factory_.GetWeakPtr()));
 }
 
 void GLES2Implementation::SetSwapBuffersCompleteCallback(
       const base::Closure& swap_buffers_complete_callback) {
@@ skipping 1122 matching lines @@
   CheckGLError();
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/client/gles2_implementation_impl_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu