Add a switch to enable compositing for scrollable frames.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index d821a8e11b077368e52b7b1f114ad2a87de79721..05cba39393a34595076a66536e549af0093165ee 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -478,8 +478,9 @@ WebPreferences WebContentsImpl::GetWebkitPrefs(RenderViewHost* rvh,
   prefs.show_fps_counter =
       command_line.HasSwitch(switches::kShowFPSCounter);
   prefs.accelerated_compositing_for_overflow_scroll_enabled =
-      command_line.HasSwitch(
-          switches::kEnableAcceleratedCompositingForOverflowScroll);
+      command_line.HasSwitch(switches::kEnableAcceleratedOverflowScroll);
+  prefs.accelerated_compositing_for_scrollable_frames_enabled =
+      command_line.HasSwitch(switches::kEnableAcceleratedScrollableFrames);
   prefs.show_paint_rects =
       command_line.HasSwitch(switches::kShowPaintRects);
   prefs.render_vsync_enabled =