mac: Improve framerate on accelerated pages in HiDPI mode.

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index b48ba3c1c5f8c898ef3a929c292b38640e3175e4..aeaba7fabde3c16eab630e1811f276ac17f4d01a 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -1088,13 +1088,11 @@ void RenderWidgetHostViewMac::AcceleratedSurfaceSuspend() {
 
 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() {