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

cc/layers/nine_patch_layer_impl_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/layers/append_quads_data.h"
 #include "cc/layers/nine_patch_layer_impl.h"
 #include "cc/quads/texture_draw_quad.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_ui_resource_layer_tree_host_impl.h"
 #include "cc/test/geometry_test_utils.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/rect_conversions.h"
 #include "ui/gfx/safe_integer_conversions.h"
 #include "ui/gfx/transform.h"
 
 namespace cc {
 namespace {
 
-gfx::Rect ToRoundedIntRect(gfx::RectF rect_f) {
+gfx::Rect ToRoundedIntRect(const gfx::RectF& rect_f) {
   return gfx::Rect(gfx::ToRoundedInt(rect_f.x()),
                    gfx::ToRoundedInt(rect_f.y()),
                    gfx::ToRoundedInt(rect_f.width()),
                    gfx::ToRoundedInt(rect_f.height()));
 }
 
 void NinePatchLayerLayoutTest(gfx::Size bitmap_size,
-                              gfx::Rect aperture_rect,
+                              const gfx::Rect& aperture_rect,
                               gfx::Size layer_size,
-                              gfx::Rect border,
+                              const gfx::Rect& border,
                               bool fill_center,
                               size_t expected_quad_size) {
   MockQuadCuller quad_culler;
   gfx::Rect visible_content_rect(layer_size);
   gfx::Rect expected_remaining(border.x(),
                                border.y(),
                                layer_size.width() - border.width(),
                                layer_size.height() - border.height());
 
   FakeImplProxy proxy;
@@ skipping 104 matching lines @@
   NinePatchLayerLayoutTest(bitmap_size,
                            aperture_rect,
                            layer_size,
                            border,
                            fill_center,
                            expected_quad_size);
 }
 
 }  // namespace
 }  // namespace cc