gfx: Make conversions from Size to SizeF be explicit.

ui/wm/core/image_grid.cc

 // Copyright (c) 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 "ui/wm/core/image_grid.h"
 
 #include <algorithm>
 
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkXfermode.h"
@@ skipping 128 matching lines @@
   const int top = min(base_top_row_height_, size_.height() / 2);
   const int bottom = min(base_bottom_row_height_, size_.height() - top);
 
   // The remaining space goes to the center image.
   int center_width = std::max(size.width() - left - right, 0);
   int center_height = std::max(size.height() - top - bottom, 0);
 
   // At non-integer scale factors, the ratio of dimensions in DIP is not
   // necessarily the same as the ratio in physical pixels due to rounding.  Set
   // the transform on each of the layers based on dimensions in pixels.
-  gfx::Size center_size_in_pixels = gfx::ToFlooredSize(gfx::ScaleSize(
-      gfx::Size(center_width, center_height), layer_->device_scale_factor()));
+  gfx::Size center_size_in_pixels = gfx::ScaleToFlooredSize(
+      gfx::Size(center_width, center_height), layer_->device_scale_factor());
 
   if (top_layer_.get()) {
     if (center_width > 0) {
       gfx::Transform transform;
       transform.Translate(left, 0);
       ScaleWidth(center_size_in_pixels, top_layer_.get(), transform);
       top_layer_->SetTransform(transform);
     }
     top_layer_->SetVisible(center_width > 0);
   }
@@ skipping 175 matching lines @@
   layer_ptr->get()->SetBounds(gfx::Rect(0, 0, size.width(), size.height()));
 
   painter_ptr->reset(new ImagePainter(image_skia));
   layer_ptr->get()->set_delegate(painter_ptr->get());
   layer_ptr->get()->SetFillsBoundsOpaquely(false);
   layer_ptr->get()->SetVisible(true);
   layer_->Add(layer_ptr->get());
 }
 
 }  // namespace wm