Defer flushing the touch queue when all touch handlers removed

content/browser/renderer_host/render_widget_host_view_aura_unittest.cc

 // Copyright (c) 2012 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/render_widget_host_view_aura.h"
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/memory/shared_memory.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 871 matching lines @@
 
   // Now start a touch event, and remove the event-handlers before the release.
   view_->OnTouchEvent(&press);
   EXPECT_TRUE(press.stopped_propagation());
   EXPECT_EQ(blink::WebInputEvent::TouchStart, view_->touch_event_.type);
   EXPECT_EQ(1U, view_->touch_event_.touchesLength);
   EXPECT_EQ(blink::WebTouchPoint::StatePressed,
             view_->touch_event_.touches[0].state);
 
   widget_host_->OnMessageReceived(ViewHostMsg_HasTouchEventHandlers(0, false));
+  EXPECT_TRUE(widget_host_->ShouldForwardTouchEvent());
+
+  // Ack'ing the outstanding event should flush the pending touch queue.
+  InputHostMsg_HandleInputEvent_ACK_Params ack;
+  ack.type = blink::WebInputEvent::TouchStart;
+  ack.state = INPUT_EVENT_ACK_STATE_CONSUMED;
+  widget_host_->OnMessageReceived(InputHostMsg_HandleInputEvent_ACK(0, ack));
   EXPECT_FALSE(widget_host_->ShouldForwardTouchEvent());
 
   ui::TouchEvent move2(ui::ET_TOUCH_MOVED, gfx::Point(20, 20), 0,
       base::Time::NowFromSystemTime() - base::Time());
   view_->OnTouchEvent(&move2);
   EXPECT_FALSE(move2.handled());
   EXPECT_EQ(blink::WebInputEvent::TouchMove, view_->touch_event_.type);
   EXPECT_EQ(1U, view_->touch_event_.touchesLength);
   EXPECT_EQ(blink::WebTouchPoint::StateMoved,
             view_->touch_event_.touches[0].state);
@@ skipping 1845 matching lines @@
   EXPECT_EQ(OVERSCROLL_NONE, overscroll_delegate()->completed_mode());
 
   SimulateGestureEvent(WebInputEvent::GestureScrollEnd,
                        blink::WebGestureDeviceTouchscreen);
   EXPECT_EQ(OVERSCROLL_NONE, overscroll_delegate()->current_mode());
   EXPECT_EQ(OVERSCROLL_EAST, overscroll_delegate()->completed_mode());
   EXPECT_EQ(3U, sink_->message_count());
 }
 
 }  // namespace content