gfx: Make conversions from Size to SizeF be explicit.

cc/test/layer_tree_test.cc

 // Copyright 2011 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/test/layer_tree_test.h"
 
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 785 matching lines @@
 
 void LayerTreeTest::SetupTree() {
   if (!layer_tree_host_->root_layer()) {
     scoped_refptr<Layer> root_layer = Layer::Create(layer_settings_);
     root_layer->SetBounds(gfx::Size(1, 1));
     root_layer->SetIsDrawable(true);
     layer_tree_host_->SetRootLayer(root_layer);
   }
 
   gfx::Size root_bounds = layer_tree_host_->root_layer()->bounds();
-  gfx::Size device_root_bounds = gfx::ToCeiledSize(
-      gfx::ScaleSize(root_bounds, layer_tree_host_->device_scale_factor()));
+  gfx::Size device_root_bounds = gfx::ScaleToCeiledSize(
+      root_bounds, layer_tree_host_->device_scale_factor());
   layer_tree_host_->SetViewportSize(device_root_bounds);
 }
 
 void LayerTreeTest::Timeout() {
   timed_out_ = true;
   EndTest();
 }
 
 void LayerTreeTest::RealEndTest() {
   // TODO(mithro): Make this method only end when not inside an impl frame.
@@ skipping 179 matching lines @@
 LayerTreeHost* LayerTreeTest::layer_tree_host() {
   // We check for a null proxy here as we sometimes ask for the layer tree host
   // when the proxy does not exist, often for checking settings after a test has
   // completed. For example, LTHPixelResourceTest::RunPixelResourceTest. See
   // elsewhere in this file for other examples.
   DCHECK(!proxy() || proxy()->IsMainThread() || proxy()->IsMainThreadBlocked());
   return layer_tree_host_.get();
 }
 
 }  // namespace cc