[#7] Pass gfx structs by const ref (gfx::Size)

content/renderer/gpu/mailbox_output_surface.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.
 
 #include "content/renderer/gpu/mailbox_output_surface.h"
 
 #include "base/logging.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_ack.h"
 #include "cc/output/gl_frame_data.h"
@@ skipping 100 matching lines @@
     returned_textures_.pop();
   }
 
   if (fbo_) {
     gl->BindFramebuffer(GL_FRAMEBUFFER, fbo_);
     gl->DeleteFramebuffers(1, &fbo_);
     fbo_ = 0;
   }
 }
 
-void MailboxOutputSurface::Reshape(gfx::Size size, float scale_factor) {
+void MailboxOutputSurface::Reshape(const gfx::Size& size, float scale_factor) {
   if (size == surface_size_)
     return;
 
   surface_size_ = size;
   device_scale_factor_ = scale_factor;
   DiscardBackbuffer();
   EnsureBackbuffer();
 }
 
 void MailboxOutputSurface::BindFramebuffer() {
@@ skipping 74 matching lines @@
   pending_textures_.push_back(current_backing_);
   current_backing_ = TransferableFrame();
 }
 
 size_t MailboxOutputSurface::GetNumAcksPending() {
   DCHECK(pending_textures_.size());
   return pending_textures_.size() - 1;
 }
 
 }  // namespace content