Handle pointer-events: none in browser process hittesting.

content/renderer/child_frame_compositing_helper.cc

Index: content/renderer/child_frame_compositing_helper.cc
diff --git a/content/renderer/child_frame_compositing_helper.cc b/content/renderer/child_frame_compositing_helper.cc
index 408fc0817b9fc0d86e739dd89fab2cdf9eafa872..ac40ae801f36f3167582f150a9c0af98dd29144e 100644
--- a/content/renderer/child_frame_compositing_helper.cc
+++ b/content/renderer/child_frame_compositing_helper.cc
@@ -293,6 +293,7 @@ void ChildFrameCompositingHelper::OnSetSurface(
     const gfx::Size& frame_size,
     float scale_factor,
     const cc::SurfaceSequence& sequence) {
+  surface_id_ = surface_id;
   scoped_refptr<ThreadSafeSender> sender(
       RenderThreadImpl::current()->thread_safe_sender());
   cc::SurfaceLayer::SatisfyCallback satisfy_callback =