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

ui/events/gestures/gesture_provider_aura.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 "ui/events/gestures/gesture_provider_aura.h"
 
 #include <utility>
 
 #include "base/auto_reset.h"
 #include "base/logging.h"
@@ skipping 24 matching lines @@
 
   auto result = filtered_gesture_provider_.OnTouchEvent(pointer_state_);
   if (!result.succeeded)
     return false;
 
   event->set_may_cause_scrolling(result.moved_beyond_slop_region);
   pointer_state_.CleanupRemovedTouchPoints(*event);
   return true;
 }
 
-void GestureProviderAura::OnTouchEventAck(uint32_t unique_touch_event_id,
-    bool event_consumed) {
+void GestureProviderAura::OnTouchEventAck(
+    uint32_t unique_touch_event_id,
+    bool event_consumed,
+    bool is_source_touch_event_set_non_blocking) {
   DCHECK(pending_gestures_.empty());
   DCHECK(!handling_event_);
   base::AutoReset<bool> handling_event(&handling_event_, true);
-  filtered_gesture_provider_.OnTouchEventAck(unique_touch_event_id,
-      event_consumed);
+  filtered_gesture_provider_.OnTouchEventAck(
+      unique_touch_event_id, event_consumed,
+      is_source_touch_event_set_non_blocking);
 }
 
 void GestureProviderAura::OnGestureEvent(const GestureEventData& gesture) {
   std::unique_ptr<ui::GestureEvent> event(
       new ui::GestureEvent(gesture.x, gesture.y, gesture.flags,
                            gesture.time, gesture.details,
                            gesture.unique_touch_event_id));
 
   if (!handling_event_) {
     // Dispatching event caused by timer.
@@ skipping 13 matching lines @@
 void GestureProviderAura::OnTouchEnter(int pointer_id, float x, float y) {
   std::unique_ptr<TouchEvent> touch_event(new TouchEvent(
       ET_TOUCH_PRESSED, gfx::Point(), ui::EventTimeForNow(),
       PointerDetails(ui::EventPointerType::POINTER_TYPE_TOUCH, pointer_id),
       EF_IS_SYNTHESIZED, 0.0f));
   gfx::PointF point(x, y);
   touch_event->set_location_f(point);
   touch_event->set_root_location_f(point);
 
   OnTouchEvent(touch_event.get());
-  OnTouchEventAck(touch_event->unique_event_id(), true);
+  OnTouchEventAck(touch_event->unique_event_id(), true /* event_consumed */,
+                  false /* is_source_touch_event_set_non_blocking */);
 }
 
 }  // namespace content