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

cc/output/direct_renderer.cc

 // 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.
 
 #include "cc/output/direct_renderer.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/containers/hash_tables.h"
@@ skipping 65 matching lines @@
                                        const gfx::RectF& quad_rect) {
   *quad_rect_transform = quad_transform;
   quad_rect_transform->Translate(0.5 * quad_rect.width() + quad_rect.x(),
                                  0.5 * quad_rect.height() + quad_rect.y());
   quad_rect_transform->Scale(quad_rect.width(), quad_rect.height());
 }
 
 void DirectRenderer::InitializeViewport(DrawingFrame* frame,
                                         const gfx::Rect& draw_rect,
                                         const gfx::Rect& viewport_rect,
-                                        gfx::Size surface_size) {
+                                        const gfx::Size& surface_size) {
   bool flip_y = FlippedFramebuffer();
 
   DCHECK_GE(viewport_rect.x(), 0);
   DCHECK_GE(viewport_rect.y(), 0);
   DCHECK_LE(viewport_rect.right(), surface_size.width());
   DCHECK_LE(viewport_rect.bottom(), surface_size.height());
   if (flip_y) {
     frame->projection_matrix = OrthoProjectionMatrix(draw_rect.x(),
                                                      draw_rect.right(),
                                                      draw_rect.bottom(),
@@ skipping 324 matching lines @@
   ScopedResource* texture = render_pass_textures_.get(id);
   return texture && texture->id();
 }
 
 // static
 gfx::Size DirectRenderer::RenderPassTextureSize(const RenderPass* render_pass) {
   return render_pass->output_rect.size();
 }
 
 }  // namespace cc