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 7581d3865efa9fec0e692af72630a7a5aa2ed378..f6dc70054cf17d0771f7778e82da3a2daa783bea 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();