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

cc/output/gl_renderer_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 "cc/output/gl_renderer.h"
 
 #include <set>
 
 #include "cc/base/math_util.h"
 #include "cc/output/compositor_frame_metadata.h"
@@ skipping 1733 matching lines @@
         ResourceProvider::Create(&output_surface_, NULL, 0, false, 1).Pass();
 
     renderer_.reset(new FakeRendererGL(&renderer_client_,
                                        &settings_,
                                        &output_surface_,
                                        resource_provider_.get()));
   }
 
   void SwapBuffers() { renderer_->SwapBuffers(CompositorFrameMetadata()); }
 
-  void DrawFrame(float device_scale_factor, gfx::Rect device_viewport_rect) {
+  void DrawFrame(float device_scale_factor,
+                 const gfx::Rect& device_viewport_rect) {
     RenderPass::Id render_pass_id(1, 0);
     TestRenderPass* render_pass = AddRenderPass(&render_passes_in_draw_order_,
                                                 render_pass_id,
                                                 device_viewport_rect,
                                                 gfx::Transform());
     AddQuad(render_pass, device_viewport_rect, SK_ColorGREEN);
 
     EXPECT_CALL(output_surface_, EnsureBackbuffer()).WillRepeatedly(Return());
 
     EXPECT_CALL(output_surface_,
@@ skipping 130 matching lines @@
   base::MessageLoop::current()->Run();
 
   // The sync point should have happened.
   EXPECT_EQ(1, sync_point_callback_count);
   EXPECT_EQ(1, other_callback_count);
 }
 #endif  // OS_ANDROID
 
 }  // namespace
 }  // namespace cc