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 80a0d1d9b598a392c7264970caac18f00a04fcd4..a019a92e9e72238c10e148b2a0c418d9a04976f7 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -1117,6 +1117,14 @@ 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) {
@@ -2104,6 +2112,11 @@ void RenderWidgetHostViewAura::SetOverscrollControllerEnabled(bool enabled) {
     overscroll_controller_.reset(new OverscrollController());
 }
 
+void RenderWidgetHostViewAura::SetOverscrollControllerForTesting(
+    std::unique_ptr<OverscrollController> controller) {
+  overscroll_controller_ = std::move(controller);
+}
+
 void RenderWidgetHostViewAura::SnapToPhysicalPixelBoundary() {
   // The top left corner of our view in window coordinates might not land on a
   // device pixel boundary if we have a non-integer device scale. In that case,