Notify OverscrollController of gesture events in plugins.

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 64e3883071e13069017e7f3f006552e7392335d9..50917ffc8e5e703bc025e518560223024cb63410 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -1109,6 +1109,14 @@ InputEventAckState RenderWidgetHostViewAura::FilterInputEvent(
                   : INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
 }
 
+InputEventAckState RenderWidgetHostViewAura::FilterChildGestureEvent(
+    const blink::WebGestureEvent& gesture_event) {
+  if (overscroll_controller_ &&
+      overscroll_controller_->WillHandleEvent(gesture_event))
+    return INPUT_EVENT_ACK_STATE_CONSUMED;
+  return INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
+}
+
 BrowserAccessibilityManager*
 RenderWidgetHostViewAura::CreateBrowserAccessibilityManager(
     BrowserAccessibilityDelegate* delegate, bool for_root_frame) {