Notify OverscrollController of gesture events in plugins.

content/browser/frame_host/render_widget_host_view_child_frame.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/frame_host/render_widget_host_view_child_frame.h"
 
 #include <algorithm>
 #include <utility>
 #include <vector>
 
@@ skipping 648 matching lines @@
       // and will also expect a notification when the fling ends. Since
       // CrOS just uses the GestureFlingStart with zero-velocity as a means
       // of indicating that touchpad scroll has ended, we don't actually want
       // a fling animation.
       // Note: this event handling is modeled on similar code in
       // TenderWidgetHostViewAura::FilterInputEvent().
       return INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS;
     }
   }
 
+  // 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;
+}
+
 BrowserAccessibilityManager*
 RenderWidgetHostViewChildFrame::CreateBrowserAccessibilityManager(
     BrowserAccessibilityDelegate* delegate, bool for_root_frame) {
   return BrowserAccessibilityManager::Create(
       BrowserAccessibilityManager::GetEmptyDocument(), delegate);
 }
 
 void RenderWidgetHostViewChildFrame::ClearCompositorSurfaceIfNecessary() {
   if (!support_)
     return;
@@ skipping 33 matching lines @@
                                                       frame_sink_id_);
   }
   support_.reset();
 }
 
 bool RenderWidgetHostViewChildFrame::HasEmbedderChanged() {
   return false;
 }
 
 }  // namespace content