Add a flag for enabling/disabling the new accelerated scrolling path

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 64a91f43e26dce0a694ac91e87f51ca01292a55c..60742dd43db5d88be22081c56128fa6fdee94b97 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -533,6 +533,14 @@ WebPreferences WebContentsImpl::GetWebkitPrefs(RenderViewHost* rvh,
   if (command_line.HasSwitch(switches::kDisableCompositedScrollingForFrames))
     prefs.composited_scrolling_for_frames_enabled = false;
 
+  prefs.universal_accelerated_compositing_for_overflow_scroll_enabled = false;
+  if (command_line.HasSwitch(
+          switches::kEnableUniversalAcceleratedOverflowScroll))
+    prefs.universal_accelerated_compositing_for_overflow_scroll_enabled = true;
+  if (command_line.HasSwitch(
+          switches::kDisableUniversalAcceleratedOverflowScroll))
+    prefs.universal_accelerated_compositing_for_overflow_scroll_enabled = false;
+
   prefs.show_paint_rects =
       command_line.HasSwitch(switches::kShowPaintRects);
   prefs.accelerated_compositing_enabled =