[#2] Pass gfx structs by const ref (gfx::Rect, gfx::RectF)

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"
@@ skipping 71 matching lines @@
   uid = 0;
   layer = GenerateUIResourceLayer(&host_impl,
                                   bitmap_size,
                                   layer_size,
                                   opaque,
                                   uid);
   QuadSizeTest(layer.Pass(), expected_quad_size);
 }
 
 void OpaqueBoundsTest(scoped_ptr<UIResourceLayerImpl> layer,
-                 gfx::Rect expected_opaque_bounds) {
+                 const gfx::Rect& expected_opaque_bounds) {
   MockQuadCuller quad_culler;
   AppendQuadsData data;
   layer->AppendQuads(&quad_culler, &data);
 
   // Verify quad rects
   const QuadList& quads = quad_culler.quad_list();
   EXPECT_GE(quads.size(), (size_t)0);
   gfx::Rect opaque_rect = quads.at(0)->opaque_rect;
   EXPECT_EQ(expected_opaque_bounds, opaque_rect);
 }
@@ skipping 40 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