[#4] Pass gfx structs by const ref (gfx::PointF)

cc/layers/layer_position_constraint_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/layer_position_constraint.h"
 
 #include <vector>
 
 #include "cc/layers/layer_impl.h"
 #include "cc/test/fake_impl_proxy.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
 #include "cc/test/geometry_test_utils.h"
 #include "cc/trees/layer_tree_host_common.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
 namespace {
 
 void SetLayerPropertiesForTesting(LayerImpl* layer,
                                   const gfx::Transform& transform,
                                   const gfx::Transform& sublayer_transform,
-                                  gfx::PointF anchor,
-                                  gfx::PointF position,
+                                  const gfx::PointF& anchor,
+                                  const gfx::PointF& position,
                                   gfx::Size bounds,
                                   bool preserves3d) {
   layer->SetTransform(transform);
   layer->SetSublayerTransform(sublayer_transform);
   layer->SetAnchorPoint(anchor);
   layer->SetPosition(position);
   layer->SetBounds(bounds);
   layer->SetPreserves3d(preserves3d);
   layer->SetContentBounds(bounds);
 }
@@ skipping 1170 matching lines @@
 
   EXPECT_TRANSFORMATION_MATRIX_EQ(expected_container2_transform,
                                   container2->draw_transform());
 
   EXPECT_TRANSFORMATION_MATRIX_EQ(expected_fixed_to_container2_transform,
                                   fixed_to_container2->draw_transform());
 }
 
 }  // namespace
 }  // namespace cc