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

cc/layers/ui_resource_layer_impl_unittest.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/layers/append_quads_data.h"
 #include "cc/layers/ui_resource_layer_impl.h"
 #include "cc/resources/ui_resource_bitmap.h"
 #include "cc/resources/ui_resource_client.h"
 #include "cc/test/fake_impl_proxy.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
 #include "cc/test/fake_ui_resource_layer_tree_host_impl.h"
 #include "cc/test/layer_test_common.h"
 #include "cc/test/mock_quad_culler.h"
 #include "cc/trees/single_thread_proxy.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/transform.h"
 
 namespace cc {
 namespace {
 
 scoped_ptr<UIResourceLayerImpl> GenerateUIResourceLayer(
     FakeUIResourceLayerTreeHostImpl* host_impl,
-    gfx::Size bitmap_size,
-    gfx::Size layer_size,
+    const gfx::Size& bitmap_size,
+    const gfx::Size& layer_size,
     bool opaque,
     UIResourceId uid) {
   gfx::Rect visible_content_rect(layer_size);
   scoped_ptr<UIResourceLayerImpl> layer =
       UIResourceLayerImpl::Create(host_impl->active_tree(), 1);
   layer->draw_properties().visible_content_rect = visible_content_rect;
   layer->SetBounds(layer_size);
   layer->SetContentBounds(layer_size);
   layer->CreateRenderSurface();
   layer->draw_properties().render_target = layer.get();
@@ skipping 107 matching lines @@
 
   layer = GenerateUIResourceLayer(
       &host_impl, bitmap_size, layer_size, skbitmap_opaque, uid);
   layer->SetContentsOpaque(true);
   expected_opaque_bounds = gfx::Rect(layer->bounds());
   OpaqueBoundsTest(layer.Pass(), expected_opaque_bounds);
 }
 
 }  // namespace
 }  // namespace cc