Move TouchEvent timeout code to the TouchEventQueue

content/browser/renderer_host/input/touch_event_queue.h

Index: content/browser/renderer_host/input/touch_event_queue.h
diff --git a/content/browser/renderer_host/input/touch_event_queue.h b/content/browser/renderer_host/input/touch_event_queue.h
index d1daa1590d732d2cc497d7ccf8fe9a4997570008..ea7eb71fe5ae516e76d30b3824d18317c2845425 100644
--- a/content/browser/renderer_host/input/touch_event_queue.h
+++ b/content/browser/renderer_host/input/touch_event_queue.h
@@ -38,7 +38,7 @@ class CONTENT_EXPORT TouchEventQueue {
 
   // The |client| must outlive the TouchEventQueue.
   explicit TouchEventQueue(TouchEventQueueClient* client);
-  virtual ~TouchEventQueue();
+  ~TouchEventQueue();
 
   // Adds an event to the queue. The event may be coalesced with previously
   // queued events (e.g. consecutive touch-move events can be coalesced into a
@@ -54,8 +54,8 @@ class CONTENT_EXPORT TouchEventQueue {
 
   // When GestureScrollBegin is received, we send a touch cancel to renderer,
   // route all the following touch events directly to client, and ignore the
-  // ack for the touch cancel. When GestureScrollEnd/GestureFlingStart is
-  // received, we resume the normal flow of sending touch events to renderer.
+  // ack for the touch cancel. When Gesture{ScrollEnd,FlingStart} is received,
+  // resume the normal flow of sending touch events to the renderer.
   void OnGestureScrollEvent(const GestureEventWithLatencyInfo& gesture_event);
 
   // Empties the queue of touch events. This may result in any number of gesture
@@ -66,20 +66,30 @@ class CONTENT_EXPORT TouchEventQueue {
   // a touch start event.
   bool IsPendingAckTouchStart() const;
 
-  // Returns whether the event-queue is empty.
+  // Sets whether a delayed touch ack will cancel and flush the current
+  // touch sequence.
+  void SetAckTimeoutEnabled(bool enabled, size_t ack_timeout_delay_ms);
+
   bool empty() const WARN_UNUSED_RESULT {
     return touch_queue_.empty();
   }
 
-  bool no_touch_to_renderer() const {
-    return no_touch_to_renderer_;
+  size_t size() const {
+    return touch_queue_.size();
+  }
+
+  bool ack_timeout_enabled() const {
+    return ack_timeout_enabled_;
   }
 
  private:
+  class TouchTimeoutHandler;
+  friend class TouchTimeoutHandler;
   friend class TouchEventQueueTest;
 
-  size_t GetQueueSize() const;
-  const TouchEventWithLatencyInfo& GetLatestEvent() const;
+  bool HasTimeoutEvent() const;
+  bool IsTimeoutRunningForTesting() const;
+  const TouchEventWithLatencyInfo& GetLatestEventForTesting() const;
 
   // Walks the queue, checking each event for |ShouldForwardToRenderer()|.
   // If true, forwards the touch event and stops processing further events.
@@ -92,6 +102,10 @@ class CONTENT_EXPORT TouchEventQueue {
                              const ui::LatencyInfo& renderer_latency_info);
 
   bool ShouldForwardToRenderer(const blink::WebTouchEvent& event) const;
+  void ForwardToRenderer(const TouchEventWithLatencyInfo& event);
+  void UpdateTouchAckStates(const blink::WebTouchEvent& event,
+                            InputEventAckState ack_result);
+
 
   // Handles touch event forwarding and ack'ed event dispatch.
   TouchEventQueueClient* client_;
@@ -108,11 +122,21 @@ class CONTENT_EXPORT TouchEventQueue {
   // is being dispatched.
   CoalescedWebTouchEvent* dispatching_touch_ack_;
 
-  // Don't send touch events to renderer. This is enabled when the page
-  // is scrolling. This behaviour is currently enabled only on aura behind
-  // a flag.
+  // Used to prevent touch timeout scheduling if we receive a synchronous
+  // ack after forwarding a touch event to the client.
+  bool dispatching_touch_;
+
+  // Don't send touch events to the renderer while scrolling.
   bool no_touch_to_renderer_;
 
+  // Whether an event in the current (multi)touch sequence was consumed by the
+  // renderer.  The touch timeout will never be activated when this is true.
+  bool renderer_is_consuming_touch_gesture_;
+
+  // Optional handler for timed-out touch event acks, disabled by default.
+  bool ack_timeout_enabled_;
+  scoped_ptr<TouchTimeoutHandler> timeout_handler_;
+
   DISALLOW_COPY_AND_ASSIGN(TouchEventQueue);
 };