Move OverscrollController to RenderWidgetHostViewAura

content/browser/renderer_host/input/gesture_event_queue.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_EVENT_QUEUE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_EVENT_QUEUE_H_
 
 #include <deque>
 
 #include "base/basictypes.h"
@@ skipping 22 matching lines @@
   virtual void SendGestureEventImmediately(
       const GestureEventWithLatencyInfo& event) = 0;
 
   virtual void OnGestureEventAck(
       const GestureEventWithLatencyInfo& event,
       InputEventAckState ack_result) = 0;
 };
 
 // Maintains WebGestureEvents in a queue before forwarding them to the renderer
 // to apply a sequence of filters on them:
-// 1. Zero-velocity fling-starts from touchpad are filtered.
-// 2. The sequence is filtered for bounces. A bounce is when the finger lifts
+// 1. The sequence is filtered for bounces. A bounce is when the finger lifts
 //    from the screen briefly during an in-progress scroll. Ifco this happens,
 //    non-GestureScrollUpdate events are queued until the de-bounce interval
 //    passes or another GestureScrollUpdate event occurs.
-// 3. Unnecessary GestureFlingCancel events are filtered. These are
+// 2. Unnecessary GestureFlingCancel events are filtered. These are
 //    GestureFlingCancels that have no corresponding GestureFlingStart in the
 //    queue.
-// 4. Taps immediately after a GestureFlingCancel (caused by the same tap) are
+// 3. Taps immediately after a GestureFlingCancel (caused by the same tap) are
 //    filtered.
-// 5. Whenever possible, events in the queue are coalesced to have as few events
+// 4. Whenever possible, events in the queue are coalesced to have as few events
 //    as possible and therefore maximize the chance that the event stream can be
 //    handled entirely by the compositor thread.
 // Events in the queue are forwarded to the renderer one by one; i.e., each
 // event is sent after receiving the ACK for previous one. The only exception is
 // that if a GestureScrollUpdate is followed by a GesturePinchUpdate, they are
 // sent together.
 // TODO(rjkroege): Possibly refactor into a filter chain:
 // http://crbug.com/148443.
 class CONTENT_EXPORT GestureEventQueue {
  public:
@@ skipping 71 matching lines @@
 
   // Returns |true| if the only event in the queue is the current event and
   // hence that event should be handled now.
   bool ShouldHandleEventNow() const;
 
   // Merge or append a GestureScrollUpdate or GesturePinchUpdate into
   // the coalescing queue.
   void MergeOrInsertScrollAndPinchEvent(
       const GestureEventWithLatencyInfo& gesture_event);
 
-  // Sub-filter for removing zero-velocity fling-starts from touchpad.
-  bool ShouldForwardForZeroVelocityFlingStart(
-      const GestureEventWithLatencyInfo& gesture_event) const;
-
   // Sub-filter for removing bounces from in-progress scrolls.
   bool ShouldForwardForBounceReduction(
       const GestureEventWithLatencyInfo& gesture_event);
 
   // Sub-filter for removing unnecessary GestureFlingCancels.
   bool ShouldForwardForGFCFiltering(
       const GestureEventWithLatencyInfo& gesture_event) const;
 
   // Sub-filter for suppressing taps immediately after a GestureFlingCancel.
   bool ShouldForwardForTapSuppression(
@@ skipping 67 matching lines @@
   // Time window in which to debounce scroll/fling ends. Note that an interval
   // of zero effectively disables debouncing.
   base::TimeDelta debounce_interval_;
 
   DISALLOW_COPY_AND_ASSIGN(GestureEventQueue);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_EVENT_QUEUE_H_