mac: Improve framerate on accelerated pages in HiDPI mode.

content/browser/renderer_host/render_widget_host_view_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/render_widget_host_view_mac.h"
 
 #include <QuartzCore/QuartzCore.h>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 1070 matching lines @@
   }
 }
 
 void RenderWidgetHostViewMac::AcceleratedSurfaceSuspend() {
   if (compositing_iosurface_.get())
     compositing_iosurface_->UnrefIOSurface();
 }
 
 bool RenderWidgetHostViewMac::HasAcceleratedSurface(
       const gfx::Size& desired_size) {
-  // TODO: What coordinates is desired_size in? Should it be
-  // compared to the pixel or logical size of compositing_iosurface_?
   return last_frame_was_accelerated_ &&
          compositing_iosurface_.get() &&
          compositing_iosurface_->HasIOSurface() &&
          (desired_size.IsEmpty() ||
-          compositing_iosurface_->pixel_io_surface_size() == desired_size);
+          compositing_iosurface_->io_surface_size() == desired_size);
 }
 
 void RenderWidgetHostViewMac::AboutToWaitForBackingStoreMsg() {
   AckPendingSwapBuffers();
 }
 
 void RenderWidgetHostViewMac::OnAcceleratedCompositingStateChange() {
 }
 
 void RenderWidgetHostViewMac::GetScreenInfo(WebKit::WebScreenInfo* results) {
@@ skipping 1885 matching lines @@
   if (!string) return NO;
 
   // If the user is currently using an IME, confirm the IME input,
   // and then insert the text from the service, the same as TextEdit and Safari.
   [self confirmComposition];
   [self insertText:string];
   return YES;
 }
 
 @end