gfx: Make conversions from Size to SizeF be explicit.

cc/layers/heads_up_display_layer_impl.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 "cc/layers/heads_up_display_layer_impl.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/numerics/safe_conversions.h"
@@ skipping 114 matching lines @@
   resources_.erase(it_erase, resources_.end());
 }
 
 bool HeadsUpDisplayLayerImpl::WillDraw(DrawMode draw_mode,
                                        ResourceProvider* resource_provider) {
   if (draw_mode == DRAW_MODE_RESOURCELESS_SOFTWARE)
     return false;
 
   internal_contents_scale_ = GetIdealContentsScale();
   internal_content_bounds_ =
-      gfx::ToCeiledSize(gfx::ScaleSize(bounds(), internal_contents_scale_));
+      gfx::ScaleToCeiledSize(bounds(), internal_contents_scale_);
 
   ReleaseUnmatchedSizeResources(resource_provider);
   AcquireResource(resource_provider);
   return LayerImpl::WillDraw(draw_mode, resource_provider);
 }
 
 void HeadsUpDisplayLayerImpl::AppendQuads(
     RenderPass* render_pass,
     AppendQuadsData* append_quads_data) {
   if (!resources_.back()->id())
@@ skipping 611 matching lines @@
   return "cc::HeadsUpDisplayLayerImpl";
 }
 
 void HeadsUpDisplayLayerImpl::AsValueInto(
     base::trace_event::TracedValue* dict) const {
   LayerImpl::AsValueInto(dict);
   dict->SetString("layer_name", "Heads Up Display Layer");
 }
 
 }  // namespace cc