Handle pointer-events: none in browser process hittesting.

content/renderer/render_frame_proxy.h

Index: content/renderer/render_frame_proxy.h
diff --git a/content/renderer/render_frame_proxy.h b/content/renderer/render_frame_proxy.h
index 39f5a815bbcbf6a08402f98b349a93ff627a6611..2c72bbda00719661fbf91ee8a7c813e3f09e1e31 100644
--- a/content/renderer/render_frame_proxy.h
+++ b/content/renderer/render_frame_proxy.h
@@ -104,6 +104,10 @@ class CONTENT_EXPORT RenderFrameProxy
   bool Send(IPC::Message* msg) override;
 
   // Out-of-process child frames receive a signal from RenderWidgetCompositor
+  // when a compositor frame will begin.
+  void WillBeginCompositorFrame();
+
+  // Out-of-process child frames receive a signal from RenderWidgetCompositor
   // when a compositor frame has committed.
   void DidCommitCompositorFrame();