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

cc/test/test_texture.cc

 // 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.
 
 #include "cc/test/test_texture.h"
 
 #include "gpu/GLES2/gl2extchromium.h"
 #include "third_party/khronos/GLES2/gl2ext.h"
 
 namespace cc {
 
-size_t TextureSizeBytes(gfx::Size size, ResourceFormat format) {
+size_t TextureSizeBytes(const gfx::Size& size, ResourceFormat format) {
   unsigned int components_per_pixel = 4;
   unsigned int bytes_per_component = 1;
   return size.width() * size.height() * components_per_pixel *
          bytes_per_component;
 }
 
 TestTexture::TestTexture() : format(RGBA_8888) {
   // Initialize default parameter values.
   params[GL_TEXTURE_MAG_FILTER] = GL_LINEAR;
   params[GL_TEXTURE_MIN_FILTER] = GL_NEAREST_MIPMAP_LINEAR;
   params[GL_TEXTURE_WRAP_S] = GL_REPEAT;
   params[GL_TEXTURE_WRAP_T] = GL_REPEAT;
   params[GL_TEXTURE_POOL_CHROMIUM] = GL_TEXTURE_POOL_UNMANAGED_CHROMIUM;
   params[GL_TEXTURE_USAGE_ANGLE] = GL_NONE;
 }
 
 TestTexture::~TestTexture() {}
 
-void TestTexture::Reallocate(gfx::Size size, ResourceFormat format) {
+void TestTexture::Reallocate(const gfx::Size& size, ResourceFormat format) {
   this->size = size;
   this->format = format;
   this->data.reset(new uint8_t[TextureSizeBytes(size, format)]);
 }
 
 bool TestTexture::IsValidParameter(GLenum pname) {
   return params.find(pname) != params.end();
 }
 
 }  // namespace cc