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

cc/test/render_pass_test_utils.h

 // 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.
 
 #ifndef CC_TEST_RENDER_PASS_TEST_UTILS_H_
 #define CC_TEST_RENDER_PASS_TEST_UTILS_H_
 
 #include "cc/base/scoped_ptr_vector.h"
 #include "cc/output/filter_operations.h"
 #include "cc/quads/render_pass.h"
 #include "cc/resources/resource_provider.h"
 #include "third_party/skia/include/core/SkColor.h"
 
 namespace gfx {
 class Rect;
 class Transform;
 }
 
 namespace cc {
 
 class SolidColorDrawQuad;
 class TestRenderPass;
 
 // Adds a new render pass with the provided properties to the given
 // render pass list.
 TestRenderPass* AddRenderPass(
     RenderPassList* pass_list,
     RenderPass::Id id,
-    gfx::Rect output_rect,
+    const gfx::Rect& output_rect,
     const gfx::Transform& root_transform);
 
 // Adds a solid quad to a given render pass.
 SolidColorDrawQuad* AddQuad(TestRenderPass* pass,
-                            gfx::Rect rect,
+                            const gfx::Rect& rect,
                             SkColor color);
 
 // Adds a solid quad to a given render pass and sets is_clipped=true.
 SolidColorDrawQuad* AddClippedQuad(TestRenderPass* pass,
-                                   gfx::Rect rect,
+                                   const gfx::Rect& rect,
                                    SkColor color);
 
 // Adds a solid quad with a transform to a given render pass.
 SolidColorDrawQuad* AddTransformedQuad(TestRenderPass* pass,
-                                       gfx::Rect rect,
+                                       const gfx::Rect& rect,
                                        SkColor color,
                                        const gfx::Transform& transform);
 
 // Adds a render pass quad to an existing render pass.
 void AddRenderPassQuad(TestRenderPass* to_pass,
                        TestRenderPass* contributing_pass);
 
 // Adds a render pass quad with the given mask resource, filter, and transform.
 void AddRenderPassQuad(TestRenderPass* toPass,
                        TestRenderPass* contributing_pass,
                        ResourceProvider::ResourceId mask_resource_id,
                        const FilterOperations& filters,
                        gfx::Transform transform);
 
 }  // namespace cc
 
 #endif  // CC_TEST_RENDER_PASS_TEST_UTILS_H_