ui: Make gfx::Size::Scale() mutate the class. Add gfx::ScaleSize() similar to Rect/Point.

ui/gfx/image/image_skia_operations.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/gfx/image/image_skia_operations.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "skia/ext/image_operations.h"
 #include "skia/ext/platform_canvas.h"
@@ skipping 309 matching lines @@
 
   // gfx::ImageSkiaSource overrides:
   virtual ImageSkiaRep GetImageForScale(ui::ScaleFactor scale_factor) OVERRIDE {
     const ImageSkiaRep& image_rep = source_.GetRepresentation(scale_factor);
     if (image_rep.GetWidth() == target_dip_size_.width() &&
         image_rep.GetHeight() == target_dip_size_.height())
       return image_rep;
 
     const float scale = ui::GetScaleFactorScale(scale_factor);
     const Size target_pixel_size = gfx::ToFlooredSize(
-        target_dip_size_.Scale(scale));
+        gfx::ScaleSize(target_dip_size_, scale));
     const SkBitmap resized = skia::ImageOperations::Resize(
         image_rep.sk_bitmap(),
         resize_method_,
         target_pixel_size.width(),
         target_pixel_size.height());
     return ImageSkiaRep(resized, scale_factor);
   }
 
  private:
   const ImageSkia source_;
@@ skipping 113 matching lines @@
     const ImageSkia& source,
     const ShadowValues& shadows) {
   const gfx::Insets shadow_padding = -gfx::ShadowValue::GetMargin(shadows);
   gfx::Size shadow_image_size = source.size();
   shadow_image_size.Enlarge(shadow_padding.width(),
                             shadow_padding.height());
   return ImageSkia(new DropShadowSource(source, shadows), shadow_image_size);
 }
 
 }  // namespace gfx