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

ui/aura/window_event_dispatcher.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/aura/window_event_dispatcher.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 162 matching lines @@
 }
 
 DispatchDetails WindowEventDispatcher::DispatchMouseExitAtPoint(
     Window* window,
     const gfx::Point& point) {
   ui::MouseEvent event(ui::ET_MOUSE_EXITED, point, point, ui::EventTimeForNow(),
                        ui::EF_NONE, ui::EF_NONE);
   return DispatchMouseEnterOrExit(window, event, ui::ET_MOUSE_EXITED);
 }
 
-void WindowEventDispatcher::ProcessedTouchEvent(uint32_t unique_event_id,
-                                                Window* window,
-                                                ui::EventResult result) {
+void WindowEventDispatcher::ProcessedTouchEvent(
+    uint32_t unique_event_id,
+    Window* window,
+    ui::EventResult result,
+    bool is_source_touch_event_set_non_blocking) {
   ui::GestureRecognizer::Gestures gestures =
-      ui::GestureRecognizer::Get()->AckTouchEvent(unique_event_id, result,
-                                                  window);
+      ui::GestureRecognizer::Get()->AckTouchEvent(
+          unique_event_id, result, is_source_touch_event_set_non_blocking,
+          window);
   DispatchDetails details = ProcessGestures(window, std::move(gestures));
   if (details.dispatcher_destroyed)
     return;
 }
 
 void WindowEventDispatcher::HoldPointerMoves() {
   if (!move_hold_count_)
     held_event_factory_.InvalidateWeakPtrs();
   ++move_hold_count_;
   TRACE_EVENT_ASYNC_BEGIN0("ui", "WindowEventDispatcher::HoldPointerMoves",
@@ skipping 349 matching lines @@
     // Do not let 'held' touch events contribute to any gestures unless it is
     // being dispatched.
     if (is_dispatched_held_event(event) || !held_move_event_ ||
         !held_move_event_->IsTouchEvent()) {
       const ui::TouchEvent& touchevent = *event.AsTouchEvent();
 
       if (!touchevent.synchronous_handling_disabled()) {
         Window* window = static_cast<Window*>(target);
         ui::GestureRecognizer::Gestures gestures =
             ui::GestureRecognizer::Get()->AckTouchEvent(
-                touchevent.unique_event_id(), event.result(), window);
+                touchevent.unique_event_id(), event.result(),
+                false /* is_source_touch_event_set_non_blocking */, window);
 
         return ProcessGestures(window, std::move(gestures));
       }
     }
   }
 
   return details;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ skipping 368 matching lines @@
     ui::KeyEvent* event) {
   if (skip_ime_ || !host_->has_input_method() ||
       (event->flags() & ui::EF_IS_SYNTHESIZED))
     return ui::EventDispatchDetails();
   host_->GetInputMethod()->DispatchKeyEvent(event);
   event->StopPropagation();
   return ui::EventDispatchDetails();
 }
 
 }  // namespace aura