[VSync Queue] Plug touch ack to gesture events and flush vsync queue if necessary

content/browser/renderer_host/input/legacy_touch_event_queue.cc

 // Copyright 2013 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/renderer_host/input/legacy_touch_event_queue.h"
 
 #include <utility>
 
 #include "base/auto_reset.h"
 #include "base/macros.h"
@@ skipping 414 matching lines @@
 }
 
 bool LegacyTouchEventQueue::IsAckTimeoutEnabled() const {
   return timeout_handler_ && timeout_handler_->IsEnabled();
 }
 
 bool LegacyTouchEventQueue::Empty() const {
   return touch_queue_.empty();
 }
 
+bool LegacyTouchEventQueue::SendTouchEventsAsync() const {
+  return send_touch_events_async_;
+}
+
 bool LegacyTouchEventQueue::HasPendingAsyncTouchMoveForTesting() const {
   return !!pending_async_touchmove_;
 }
 
 bool LegacyTouchEventQueue::IsTimeoutRunningForTesting() const {
   return timeout_handler_ && timeout_handler_->IsTimeoutTimerRunning();
 }
 
 const TouchEventWithLatencyInfo&
 LegacyTouchEventQueue::GetLatestEventForTesting() const {
@@ skipping 198 matching lines @@
     if (ack_result == INPUT_EVENT_ACK_STATE_CONSUMED)
       send_touch_events_async_ = false;
     has_handler_for_current_sequence_ |=
         ack_result != INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS;
   } else if (WebTouchEventTraits::IsTouchSequenceEnd(event)) {
     has_handler_for_current_sequence_ = false;
   }
 }
 
 }  // namespace content