Notify OverscrollController of gesture events in plugins.

content/browser/frame_host/render_widget_host_view_child_frame.cc

Index: content/browser/frame_host/render_widget_host_view_child_frame.cc
diff --git a/content/browser/frame_host/render_widget_host_view_child_frame.cc b/content/browser/frame_host/render_widget_host_view_child_frame.cc
index 8c14e80cb67245f110b24e0d70c72d64760eeeb3..2c2a23f9343135361e63800a91ac7dccdf5ba281 100644
--- a/content/browser/frame_host/render_widget_host_view_child_frame.cc
+++ b/content/browser/frame_host/render_widget_host_view_child_frame.cc
@@ -666,6 +666,22 @@ InputEventAckState RenderWidgetHostViewChildFrame::FilterInputEvent(
     }
   }
 
+  // TODO(mcnee): Allow the root RWHV to consume the child's
+  // GestureScrollUpdates. This is needed to prevent the child from consuming
+  // them after the root has started an overscroll.

[Charlie Reis, 2017/05/05 23:45:44]

Is there a bug associated with this that you can list here?

[Kevin McNee, 2017/05/17 22:39:33]

Done.

+
+  return INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
+}
+
+InputEventAckState RenderWidgetHostViewChildFrame::FilterChildGestureEvent(
+    const blink::WebGestureEvent& gesture_event) {
+  // We may be the owner of a RenderWidgetHostViewGuest,
+  // so we talk to the root RWHV on its behalf.
+  // TODO(mcnee): Remove once MimeHandlerViewGuest is based on OOPIF.
+  // See crbug.com/659750
+  if (frame_connector_)
+    return frame_connector_->GetRootRenderWidgetHostView()
+        ->FilterChildGestureEvent(gesture_event);
   return INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
 }