gfx: Make conversions from Size to SizeF be explicit.

ui/views/animation/test/ink_drop_animation_test_api.cc

 // Copyright 2015 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 "ui/views/animation/ink_drop_animation.h"
 #include "ui/views/animation/test/ink_drop_animation_test_api.h"
 
 namespace views {
 namespace test {
 
 InkDropAnimationTestApi::InkDropAnimationTestApi(
     InkDropAnimation* ink_drop_animation)
     : ink_drop_animation_(ink_drop_animation) {}
 
 InkDropAnimationTestApi::~InkDropAnimationTestApi() {}
 
 void InkDropAnimationTestApi::CalculateCircleTransforms(
-    const gfx::SizeF size,
+    const gfx::Size& size,
     InkDropTransforms* transforms_out) const {
   ink_drop_animation_->CalculateCircleTransforms(size, transforms_out);
 }
 void InkDropAnimationTestApi::CalculateRectTransforms(
-    const gfx::SizeF size,
+    const gfx::Size& size,
     float corner_radius,
     InkDropTransforms* transforms_out) const {
   ink_drop_animation_->CalculateRectTransforms(size, corner_radius,
                                                transforms_out);
 }
 
 }  // namespace test
 }  // namespace views