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

content/browser/renderer_host/compositing_iosurface_mac.mm

 // 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/browser/renderer_host/compositing_iosurface_mac.h"
 
 #include <OpenGL/OpenGL.h>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 311 matching lines @@
   CGLSetCurrentContext(cglContext_);
 
   bool has_io_surface = MapIOSurfaceToTexture(io_surface_handle_);
 
   TRACE_EVENT1("browser", "CompositingIOSurfaceMac::DrawIOSurface",
                "has_io_surface", has_io_surface);
 
   [glContext_ setView:view];
   gfx::Size window_size(NSSizeToCGSize([view frame].size));
   gfx::Size pixel_window_size = gfx::ToFlooredSize(
-      window_size.Scale(scale_factor));
+      gfx::ScaleSize(window_size, scale_factor));
   glViewport(0, 0, pixel_window_size.width(), pixel_window_size.height());
 
   // TODO: After a resolution change, the DPI-ness of the view and the
   // IOSurface might not be in sync.
   io_surface_size_ = gfx::ToFlooredSize(
-      pixel_io_surface_size_.Scale(1.0 / scale_factor));
+      gfx::ScaleSize(pixel_io_surface_size_, 1.0 / scale_factor));
   quad_.set_size(io_surface_size_, pixel_io_surface_size_);
 
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
 
   // Note that the projection keeps things in view units, so the use of
   // window_size / io_surface_size_ (as opposed to the pixel_ variants) below is
   // correct.
   glOrtho(0, window_size.width(), window_size.height(), 0, -1, 1);
   glMatrixMode(GL_MODELVIEW);
@@ skipping 489 matching lines @@
   glDeleteFramebuffersEXT(1, &copy_context_.frame_buffer); CHECK_GL_ERROR();
   glDeleteTextures(1, &copy_context_.frame_buffer_texture); CHECK_GL_ERROR();
   glDeleteBuffers(1, &copy_context_.pixel_buffer); CHECK_GL_ERROR();
   if (copy_context_.use_fence) {
     glDeleteFencesAPPLE(1, &copy_context_.fence); CHECK_GL_ERROR();
   }
   copy_context_.Reset();
 }
 
 }  // namespace content