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 b979394f565d7b93020fd3e2f94cbce8a0ddb9a9..ff02de810c82fde18422827fe95e69d408258c48 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
@@ -728,6 +728,23 @@ 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.
+  // See crbug.com/713368
+
+  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;
 }