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

cc/layers/scrollbar_layer_unittest.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 "base/containers/hash_tables.h"
 #include "cc/animation/scrollbar_animation_controller.h"
 #include "cc/layers/append_quads_data.h"
 #include "cc/layers/painted_scrollbar_layer.h"
 #include "cc/layers/painted_scrollbar_layer_impl.h"
 #include "cc/layers/scrollbar_layer_interface.h"
@@ skipping 435 matching lines @@
   EXPECT_RECT_EQ(gfx::Rect(20.f, 10.f, 20.f, 3.f),
                  horizontal_scrollbar_layer_->ComputeThumbQuadRect());
   EXPECT_RECT_EQ(gfx::Rect(0.f, 22, 3.f, 22.f),
                  vertical_scrollbar_layer_->ComputeThumbQuadRect());
 }
 
 class ScrollbarLayerTestMaxTextureSize : public LayerTreeTest {
  public:
   ScrollbarLayerTestMaxTextureSize() {}
 
-  void SetScrollbarBounds(gfx::Size bounds) { bounds_ = bounds; }
+  void SetScrollbarBounds(const gfx::Size& bounds) { bounds_ = bounds; }
 
   virtual void BeginTest() OVERRIDE {
     scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar);
     scrollbar_layer_ = PaintedScrollbarLayer::Create(scrollbar.Pass(), 1);
     scrollbar_layer_->SetLayerTreeHost(layer_tree_host());
     scrollbar_layer_->SetBounds(bounds_);
     layer_tree_host()->root_layer()->AddChild(scrollbar_layer_);
 
     scroll_layer_ = Layer::Create();
     scrollbar_layer_->SetScrollLayerId(scroll_layer_->id());
@@ skipping 260 matching lines @@
 TEST_F(ScaledScrollbarLayerTestResourceCreation, ScaledResourceUpload) {
   // Pick a test scale that moves the scrollbar's (non-zero) position to
   // a non-pixel-aligned location.
   TestResourceUpload(.041f);
   TestResourceUpload(1.41f);
   TestResourceUpload(4.1f);
 }
 
 }  // namespace
 }  // namespace cc