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

content/renderer/browser_plugin/browser_plugin_backing_store.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 "content/renderer/browser_plugin/browser_plugin_backing_store.h"
 
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/rect_conversions.h"
 #include "ui/gfx/size_conversions.h"
 #include "ui/surface/transport_dib.h"
 
 namespace content {
 
 // Max height and width for layers
 static const int kMaxSize = 23170;
 
 BrowserPluginBackingStore::BrowserPluginBackingStore(
     const gfx::Size& size,
     float scale_factor)
     : size_(size),
       scale_factor_(scale_factor) {
-  gfx::Size pixel_size = gfx::ToFlooredSize(size.Scale(scale_factor));
+  gfx::Size pixel_size = gfx::ToFlooredSize(gfx::ScaleSize(size, scale_factor));
   bitmap_.setConfig(SkBitmap::kARGB_8888_Config,
       pixel_size.width(), pixel_size.height());
   bitmap_.allocPixels();
   canvas_.reset(new SkCanvas(bitmap_));
 }
 
 BrowserPluginBackingStore::~BrowserPluginBackingStore() {
 }
 
 void BrowserPluginBackingStore::PaintToBackingStore(
@@ skipping 52 matching lines @@
 
   int x = std::min(pixel_rect.x(), pixel_rect.x() - pixel_dx);
   int y = std::min(pixel_rect.y(), pixel_rect.y() - pixel_dy);
   int w = pixel_rect.width() + abs(pixel_dx);
   int h = pixel_rect.height() + abs(pixel_dy);
   SkIRect rect = SkIRect::MakeXYWH(x, y, w, h);
   bitmap_.scrollRect(&rect, pixel_dx, pixel_dy);
 }
 
 }  // namespace content