Animated scroll shouldn't consume unhandled scrolls for OOPIFs.

content/browser/renderer_host/compositor_impl_android.cc

Index: content/browser/renderer_host/compositor_impl_android.cc
diff --git a/content/browser/renderer_host/compositor_impl_android.cc b/content/browser/renderer_host/compositor_impl_android.cc
index f572bb644c23f4ebc8b8936dd00c1de9de3a2b6f..efbd3eb813a31fef715895845bb8aa0070fd0431 100644
--- a/content/browser/renderer_host/compositor_impl_android.cc
+++ b/content/browser/renderer_host/compositor_impl_android.cc
@@ -451,6 +451,10 @@ CompositorImpl::~CompositorImpl() {
   GetSurfaceManager()->InvalidateFrameSinkId(frame_sink_id_);
 }
 
+bool CompositorImpl::IsForSubframe() {
+  return false;

[Charlie Reis, 2017/04/18 21:59:03]

I'm not familiar with this class, but would this cause a problem for OOPIFs on
Android?  Or do those not have one of these?

[wjmaclean, 2017/04/18 23:26:49]

I think, at worst, it leaves the status quo unchanged for Android. I don't think
Android uses smooth scrolling for mouse wheels, or other 'bubbling' events ... I
could be wrong though, in which case this might be the starting point to deal
with that.

+}
+
 ui::UIResourceProvider& CompositorImpl::GetUIResourceProvider() {
   return *this;
 }