gfx: Make conversions from Size to SizeF be explicit.

cc/layers/picture_layer_impl_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/picture_layer_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 #include <utility>
@@ skipping 1482 matching lines @@
       static_cast<FakePictureLayerImpl*>(active_layer_->mask_layer());
 
   // Mask layers have a tiling with a single tile in it.
   EXPECT_EQ(1u, active_mask->HighResTiling()->AllTilesForTesting().size());
   // The mask resource exists.
   ResourceId mask_resource_id;
   gfx::Size mask_texture_size;
   active_mask->GetContentsResourceId(&mask_resource_id, &mask_texture_size);
   EXPECT_NE(0u, mask_resource_id);
   gfx::Size expected_mask_texture_size =
-      gfx::ToCeiledSize(gfx::ScaleSize(active_mask->bounds(), 1.3f));
+      gfx::ScaleToCeiledSize(active_mask->bounds(), 1.3f);
   EXPECT_EQ(mask_texture_size, expected_mask_texture_size);
 }
 
 TEST_F(PictureLayerImplTest, ReleaseResources) {
   gfx::Size layer_bounds(1300, 1900);
   SetupDefaultTrees(layer_bounds);
   EXPECT_EQ(1u, pending_layer_->tilings()->num_tilings());
 
   // All tilings should be removed when losing output surface.
   active_layer_->ReleaseResources();
@@ skipping 3465 matching lines @@
   // New low res tiling.
   EXPECT_TRUE(tilings->tiling_at(2)->may_contain_low_resolution_tiles());
 
   // This tiling will be high res now, it won't contain low res content since it
   // was all destroyed.
   EXPECT_FALSE(tilings->tiling_at(1)->may_contain_low_resolution_tiles());
 }
 
 }  // namespace
 }  // namespace cc