Move TouchEvent timeout code to the TouchEventQueue

content/browser/renderer_host/input/touch_event_queue_unittest.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 "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "content/browser/renderer_host/input/timeout_monitor.h"
 #include "content/browser/renderer_host/input/touch_event_queue.h"
 #include "content/common/input/synthetic_web_input_event_builders.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
 using blink::WebGestureEvent;
 using blink::WebInputEvent;
 using blink::WebTouchEvent;
 using blink::WebTouchPoint;
 
 namespace content {
+namespace {
+const size_t kDefaultTouchTimeoutDelayMs = 10;
+}
 
 class TouchEventQueueTest : public testing::Test,
                             public TouchEventQueueClient {
  public:
   TouchEventQueueTest()
       : sent_event_count_(0),
         acked_event_count_(0),
         last_acked_event_state_(INPUT_EVENT_ACK_STATE_UNKNOWN) {}
 
   virtual ~TouchEventQueueTest() {}
@@ skipping 31 matching lines @@
       scoped_ptr<WebGestureEvent> followup_gesture_event =
           followup_gesture_event_.Pass();
       queue_->OnGestureScrollEvent(
           GestureEventWithLatencyInfo(*followup_gesture_event,
                                       ui::LatencyInfo()));
     }
   }
 
  protected:
 
+  void SetUpForTimeoutTesting(size_t timeout_delay_ms) {
+    queue_->SetAckTimeoutEnabled(true, timeout_delay_ms);
+  }
+
   void SendTouchEvent(const WebTouchEvent& event) {
     queue_->QueueEvent(TouchEventWithLatencyInfo(event, ui::LatencyInfo()));
   }
 
-  void SendTouchEvent() {
-    SendTouchEvent(touch_event_);
-    touch_event_.ResetPoints();
-  }
-
   void SendGestureEvent(WebInputEvent::Type type) {
     WebGestureEvent event;
     event.type = type;
     queue_->OnGestureScrollEvent(
         GestureEventWithLatencyInfo(event, ui::LatencyInfo()));
   }
 
   void SendTouchEventACK(InputEventAckState ack_result) {
     queue_->ProcessTouchAck(ack_result, ui::LatencyInfo());
   }
 
   void SetFollowupEvent(const WebTouchEvent& event) {
     followup_touch_event_.reset(new WebTouchEvent(event));
   }
 
   void SetFollowupEvent(const WebGestureEvent& event) {
     followup_gesture_event_.reset(new WebGestureEvent(event));
   }
 
   void SetSyncAckResult(InputEventAckState sync_ack_result) {
     sync_ack_result_.reset(new InputEventAckState(sync_ack_result));
   }
 
-  int PressTouchPoint(int x, int y) {
-    return touch_event_.PressPoint(x, y);
+  void PressTouchPoint(int x, int y) {
+    touch_event_.PressPoint(x, y);
+    SendTouchEvent();
   }
 
   void MoveTouchPoint(int index, int x, int y) {
     touch_event_.MovePoint(index, x, y);
+    SendTouchEvent();
+  }
+
+  void MoveTouchPoints(int index0, int x0, int y0, int index1, int x1, int y1) {
+    touch_event_.MovePoint(index0, x0, y0);
+    touch_event_.MovePoint(index1, x1, y1);
+    SendTouchEvent();
   }
 
   void ReleaseTouchPoint(int index) {
     touch_event_.ReleasePoint(index);
+    SendTouchEvent();
   }
 
   void CancelTouchPoint(int index) {
     touch_event_.CancelPoint(index);
+    SendTouchEvent();
   }
 
   size_t GetAndResetAckedEventCount() {
     size_t count = acked_event_count_;
     acked_event_count_ = 0;
     return count;
   }
 
   size_t GetAndResetSentEventCount() {
     size_t count = sent_event_count_;
     sent_event_count_ = 0;
     return count;
   }
 
   bool IsPendingAckTouchStart() const {
     return queue_->IsPendingAckTouchStart();
   }
 
   void Flush() {
     queue_->FlushQueue();
   }
 
+  void SetEnableTouchForwarding(bool enabled) {
+    queue_->no_touch_to_renderer_ = !enabled;
+  }
+
+  bool WillForwardTouchEvents() {
+    return !queue_->no_touch_to_renderer_ && !queue_->HasTimeoutEvent();
+  }
+
+  bool IsTimeoutRunning() {
+    return queue_->IsTimeoutRunningForTesting();
+  }
+
   size_t queued_event_count() const {
-    return queue_->GetQueueSize();
+    return queue_->size();
   }
 
   const WebTouchEvent& latest_event() const {
-    return queue_->GetLatestEvent().event;
+    return queue_->GetLatestEventForTesting().event;
   }
 
   const WebTouchEvent& acked_event() const {
     return last_acked_event_;
   }
 
   const WebTouchEvent& sent_event() const {
     return last_sent_event_;
   }
 
   InputEventAckState acked_event_state() const {
     return last_acked_event_state_;
   }
 
   void set_no_touch_to_renderer(bool no_touch) {
     queue_->no_touch_to_renderer_ = no_touch;
   }
 
   bool no_touch_to_renderer() const {
     return queue_->no_touch_to_renderer_;
   }
 
  private:
+  void SendTouchEvent() {
+    SendTouchEvent(touch_event_);
+    touch_event_.ResetPoints();
+  }
+
   scoped_ptr<TouchEventQueue> queue_;
   size_t sent_event_count_;
   size_t acked_event_count_;
   WebTouchEvent last_sent_event_;
   WebTouchEvent last_acked_event_;
   InputEventAckState last_acked_event_state_;
   SyntheticWebTouchEvent touch_event_;
   scoped_ptr<WebTouchEvent> followup_touch_event_;
   scoped_ptr<WebGestureEvent> followup_gesture_event_;
   scoped_ptr<InputEventAckState> sync_ack_result_;
+  base::MessageLoopForUI message_loop_;
 };
 
 
 // Tests that touch-events are queued properly.
 TEST_F(TouchEventQueueTest, Basic) {
   PressTouchPoint(1, 1);
-  SendTouchEvent();
   EXPECT_EQ(1U, queued_event_count());
   EXPECT_EQ(1U, GetAndResetSentEventCount());
 
   // The second touch should not be sent since one is already in queue.
   MoveTouchPoint(0, 5, 5);
-  SendTouchEvent();
   EXPECT_EQ(2U, queued_event_count());
   EXPECT_EQ(0U, GetAndResetSentEventCount());
 
   // Receive an ACK for the first touch-event.
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_CONSUMED);
   EXPECT_EQ(1U, queued_event_count());
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
   EXPECT_EQ(WebInputEvent::TouchStart, acked_event().type);
 
   // Receive an ACK for the second touch-event.
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_CONSUMED);
   EXPECT_EQ(0U, queued_event_count());
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
   EXPECT_EQ(WebInputEvent::TouchMove, acked_event().type);
 }
 
 // Tests that the touch-queue is emptied if a page stops listening for touch
 // events.
 TEST_F(TouchEventQueueTest, Flush) {
   Flush();
   EXPECT_EQ(0U, queued_event_count());
   EXPECT_EQ(0U, GetAndResetSentEventCount());
 
   // Send a touch-press event.
   PressTouchPoint(1, 1);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetSentEventCount());
 
   ReleaseTouchPoint(0);
-  SendTouchEvent();
 
   // Events will be queued until the first sent event is ack'ed.
   for (int i = 5; i < 15; ++i) {
     PressTouchPoint(1, 1);
-    SendTouchEvent();
     MoveTouchPoint(0, i, i);
-    SendTouchEvent();
     ReleaseTouchPoint(0);
-    SendTouchEvent();
   }
   EXPECT_EQ(32U, queued_event_count());
   EXPECT_EQ(0U, GetAndResetSentEventCount());
 
   // Receive an ACK for the first touch-event. One of the queued touch-event
   // should be forwarded.
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_CONSUMED);
   EXPECT_EQ(31U, queued_event_count());
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
   EXPECT_EQ(WebInputEvent::TouchStart, acked_event().type);
 
   // Flush the queue. The touch-event queue should now be emptied, but none of
   // the queued touch-events should be sent to the renderer.
   Flush();
   EXPECT_EQ(0U, queued_event_count());
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(31U, GetAndResetAckedEventCount());
 }
 
 // Tests that touch-events are coalesced properly in the queue.
 TEST_F(TouchEventQueueTest, Coalesce) {
   // Send a touch-press event.
   PressTouchPoint(1, 1);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetSentEventCount());
 
   // Send a few touch-move events, followed by a touch-release event. All the
   // touch-move events should be coalesced into a single event.
-  for (int i = 5; i < 15; ++i) {
+  for (int i = 5; i < 15; ++i)
     MoveTouchPoint(0, i, i);
-    SendTouchEvent();
-  }
+
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   ReleaseTouchPoint(0);
-  SendTouchEvent();
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(3U, queued_event_count());
 
   // ACK the press.  Coalesced touch-move events should be sent.
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_CONSUMED);
   EXPECT_EQ(2U, queued_event_count());
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
   EXPECT_EQ(WebInputEvent::TouchStart, acked_event().type);
   EXPECT_EQ(INPUT_EVENT_ACK_STATE_CONSUMED, acked_event_state());
@@ skipping 11 matching lines @@
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
   EXPECT_EQ(WebInputEvent::TouchEnd, acked_event().type);
 }
 
 // Tests that an event that has already been sent but hasn't been ack'ed yet
 // doesn't get coalesced with newer events.
 TEST_F(TouchEventQueueTest, SentTouchEventDoesNotCoalesce) {
   // Send a touch-press event.
   PressTouchPoint(1, 1);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetSentEventCount());
 
   // Send a few touch-move events, followed by a touch-release event. All the
   // touch-move events should be coalesced into a single event.
-  for (int i = 5; i < 15; ++i) {
+  for (int i = 5; i < 15; ++i)
     MoveTouchPoint(0, i, i);
-    SendTouchEvent();
-  }
+
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(2U, queued_event_count());
 
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, queued_event_count());
 
   // The coalesced touch-move event has been sent to the renderer. Any new
   // touch-move event should not be coalesced with the sent event.
   MoveTouchPoint(0, 5, 5);
-  SendTouchEvent();
   EXPECT_EQ(2U, queued_event_count());
 
   MoveTouchPoint(0, 7, 7);
-  SendTouchEvent();
   EXPECT_EQ(2U, queued_event_count());
 }
 
 // Tests that coalescing works correctly for multi-touch events.
 TEST_F(TouchEventQueueTest, MultiTouch) {
   // Press the first finger.
   PressTouchPoint(1, 1);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetSentEventCount());
 
   // Move the finger.
   MoveTouchPoint(0, 5, 5);
-  SendTouchEvent();
   EXPECT_EQ(2U, queued_event_count());
 
   // Now press a second finger.
   PressTouchPoint(2, 2);
-  SendTouchEvent();
   EXPECT_EQ(3U, queued_event_count());
 
   // Move both fingers.
-  MoveTouchPoint(0, 10, 10);
+  MoveTouchPoints(0, 10, 10, 1, 20, 20);
   MoveTouchPoint(1, 20, 20);
-  SendTouchEvent();
   EXPECT_EQ(4U, queued_event_count());
 
   // Move only one finger now.
   MoveTouchPoint(0, 15, 15);
-  SendTouchEvent();
   EXPECT_EQ(4U, queued_event_count());
 
   // Move the other finger.
   MoveTouchPoint(1, 25, 25);
-  SendTouchEvent();
   EXPECT_EQ(4U, queued_event_count());
 
   // Make sure both fingers are marked as having been moved in the coalesced
   // event.
   const WebTouchEvent& event = latest_event();
   EXPECT_EQ(WebTouchPoint::StateMoved, event.touches[0].state);
   EXPECT_EQ(WebTouchPoint::StateMoved, event.touches[1].state);
 }
 
 // Tests that if a touch-event queue is destroyed in response to a touch-event
 // in the renderer, then there is no crash when the ACK for that touch-event
 // comes back.
 TEST_F(TouchEventQueueTest, AckAfterQueueFlushed) {
   // Send some touch-events to the renderer.
   PressTouchPoint(1, 1);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, queued_event_count());
 
   MoveTouchPoint(0, 10, 10);
-  SendTouchEvent();
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(2U, queued_event_count());
 
   // Receive an ACK for the press. This should cause the queued touch-move to
   // be sent to the renderer.
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_CONSUMED);
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, queued_event_count());
 
   Flush();
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(0U, queued_event_count());
 
   // Now receive an ACK for the move.
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_CONSUMED);
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(0U, queued_event_count());
 }
 
 // Tests that touch-move events are not sent to the renderer if the preceding
 // touch-press event did not have a consumer (and consequently, did not hit the
 // main thread in the renderer). Also tests that all queued/coalesced touch
 // events are flushed immediately when the ACK for the touch-press comes back
 // with NO_CONSUMER status.
 TEST_F(TouchEventQueueTest, NoConsumer) {
   // The first touch-press should reach the renderer.
   PressTouchPoint(1, 1);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetSentEventCount());
 
   // The second touch should not be sent since one is already in queue.
   MoveTouchPoint(0, 5, 5);
-  SendTouchEvent();
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(2U, queued_event_count());
 
   // Receive an ACK for the first touch-event. This should release the queued
   // touch-event, but it should not be sent to the renderer.
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS);
   EXPECT_EQ(0U, queued_event_count());
   EXPECT_EQ(WebInputEvent::TouchMove, acked_event().type);
   EXPECT_EQ(2U, GetAndResetAckedEventCount());
   EXPECT_EQ(0U, GetAndResetSentEventCount());
 
   // Send a release event. This should not reach the renderer.
   ReleaseTouchPoint(0);
-  SendTouchEvent();
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(WebInputEvent::TouchEnd, acked_event().type);
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
 
   // Send a press-event, followed by move and release events, and another press
   // event, before the ACK for the first press event comes back. All of the
   // events should be queued first. After the NO_CONSUMER ack for the first
   // touch-press, all events upto the second touch-press should be flushed.
   PressTouchPoint(10, 10);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetSentEventCount());
 
   MoveTouchPoint(0, 5, 5);
-  SendTouchEvent();
   MoveTouchPoint(0, 6, 5);
-  SendTouchEvent();
   ReleaseTouchPoint(0);
-  SendTouchEvent();
 
   PressTouchPoint(6, 5);
-  SendTouchEvent();
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   // The queue should hold the first sent touch-press event, the coalesced
   // touch-move event, the touch-end event and the second touch-press event.
   EXPECT_EQ(4U, queued_event_count());
 
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS);
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(WebInputEvent::TouchEnd, acked_event().type);
   EXPECT_EQ(4U, GetAndResetAckedEventCount());
   EXPECT_EQ(1U, queued_event_count());
 
   // ACK the second press event as NO_CONSUMER too.
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS);
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(WebInputEvent::TouchStart, acked_event().type);
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
   EXPECT_EQ(0U, queued_event_count());
 
   // Send a second press event. Even though the first touch had NO_CONSUMER,
   // this press event should reach the renderer.
   PressTouchPoint(1, 1);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, queued_event_count());
 }
 
 TEST_F(TouchEventQueueTest, ConsumerIgnoreMultiFinger) {
   // Press two touch points and move them around a bit. The renderer consumes
   // the events for the first touch point, but returns NO_CONSUMER_EXISTS for
   // the second touch point.
 
   PressTouchPoint(1, 1);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetSentEventCount());
 
   MoveTouchPoint(0, 5, 5);
-  SendTouchEvent();
 
   PressTouchPoint(10, 10);
-  SendTouchEvent();
 
   MoveTouchPoint(0, 2, 2);
-  SendTouchEvent();
 
   MoveTouchPoint(1, 4, 10);
-  SendTouchEvent();
 
-  MoveTouchPoint(0, 10, 10);
-  MoveTouchPoint(1, 20, 20);
-  SendTouchEvent();
+  MoveTouchPoints(0, 10, 10, 1, 20, 20);
 
   // Since the first touch-press is still pending ACK, no other event should
   // have been sent to the renderer.
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   // The queue includes the two presses, the first touch-move of the first
   // point, and a coalesced touch-move of both points.
   EXPECT_EQ(4U, queued_event_count());
 
   // ACK the first press as CONSUMED. This should cause the first touch-move of
   // the first touch-point to be dispatched.
@@ skipping 15 matching lines @@
   EXPECT_EQ(1U, queued_event_count());
 
   // ACK the coalesced move as NOT_CONSUMED.
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(0U, queued_event_count());
 
   // Move just the second touch point. Because the first touch point did not
   // move, this event should not reach the renderer.
   MoveTouchPoint(1, 30, 30);
-  SendTouchEvent();
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(0U, queued_event_count());
 
   // Move just the first touch point. This should reach the renderer.
   MoveTouchPoint(0, 10, 10);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, queued_event_count());
 
   // Move both fingers. This event should reach the renderer (after the ACK of
   // the previous move event is received), because the first touch point did
   // move.
-  MoveTouchPoint(0, 15, 15);
-  MoveTouchPoint(1, 25, 25);
-  SendTouchEvent();
+  MoveTouchPoints(0, 15, 15, 1, 25, 25);
   EXPECT_EQ(0U, GetAndResetSentEventCount());
 
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_CONSUMED);
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, queued_event_count());
 
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_CONSUMED);
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(0U, queued_event_count());
 
   // Release the first finger. Then move the second finger around some, then
   // press another finger. Once the release event is ACKed, the move events of
   // the second finger should be immediately released to the view, and the
   // touch-press event should be dispatched to the renderer.
   ReleaseTouchPoint(0);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, queued_event_count());
 
   MoveTouchPoint(1, 40, 40);
-  SendTouchEvent();
 
   MoveTouchPoint(1, 50, 50);
-  SendTouchEvent();
 
   PressTouchPoint(1, 1);
-  SendTouchEvent();
 
   MoveTouchPoint(1, 30, 30);
-  SendTouchEvent();
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(4U, queued_event_count());
 
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(2U, queued_event_count());
   EXPECT_EQ(WebInputEvent::TouchMove, acked_event().type);
 
   // ACK the press with NO_CONSUMED_EXISTS. This should release the queued
   // touch-move events to the view.
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS);
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(0U, queued_event_count());
   EXPECT_EQ(WebInputEvent::TouchMove, acked_event().type);
 
   ReleaseTouchPoint(2);
   ReleaseTouchPoint(1);
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(0U, queued_event_count());
 }
 
 // Tests that touch-event's enqueued via a touch ack are properly handled.
 TEST_F(TouchEventQueueTest, AckWithFollowupEvents) {
   // Queue a touch down.
   PressTouchPoint(1, 1);
-  SendTouchEvent();
   EXPECT_EQ(1U, queued_event_count());
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(0U, GetAndResetAckedEventCount());
 
   // Create a touch event that will be queued synchronously by a touch ack.
   // Note, this will be triggered by all subsequent touch acks.
   WebTouchEvent followup_event;
   followup_event.type = WebInputEvent::TouchStart;
   followup_event.touchesLength = 1;
   followup_event.touches[0].id = 1;
   followup_event.touches[0].state = WebTouchPoint::StatePressed;
   SetFollowupEvent(followup_event);
 
   // Receive an ACK for the press. This should cause the followup touch-move to
   // be sent to the renderer.
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_CONSUMED);
   EXPECT_EQ(1U, queued_event_count());
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
   EXPECT_EQ(INPUT_EVENT_ACK_STATE_CONSUMED, acked_event_state());
   EXPECT_EQ(WebInputEvent::TouchStart, acked_event().type);
 
   // Queue another event.
-  PressTouchPoint(1, 1);
   MoveTouchPoint(0, 2, 2);
-  SendTouchEvent();
   EXPECT_EQ(2U, queued_event_count());
 
   // Receive an ACK for the touch-move followup event. This should cause the
   // subsequent touch move event be sent to the renderer.
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_CONSUMED);
   EXPECT_EQ(1U, queued_event_count());
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
 }
 
 // Tests that touch-events can be synchronously ack'ed.
 TEST_F(TouchEventQueueTest, SynchronousAcks) {
   // TouchStart
   SetSyncAckResult(INPUT_EVENT_ACK_STATE_CONSUMED);
   PressTouchPoint(1, 1);
-  SendTouchEvent();
   EXPECT_EQ(0U, queued_event_count());
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
 
   // TouchMove
   SetSyncAckResult(INPUT_EVENT_ACK_STATE_CONSUMED);
-  PressTouchPoint(1, 1);
   MoveTouchPoint(0, 2, 2);
-  SendTouchEvent();
   EXPECT_EQ(0U, queued_event_count());
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
 
   // TouchEnd
   SetSyncAckResult(INPUT_EVENT_ACK_STATE_CONSUMED);
-  PressTouchPoint(1, 1);
   ReleaseTouchPoint(0);
-  SendTouchEvent();
   EXPECT_EQ(0U, queued_event_count());
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
 
   // TouchCancel (first inserting a TouchStart so the TouchCancel will be sent)
   PressTouchPoint(1, 1);
-  SendTouchEvent();
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_CONSUMED);
   EXPECT_EQ(0U, queued_event_count());
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
 
   SetSyncAckResult(INPUT_EVENT_ACK_STATE_CONSUMED);
-  PressTouchPoint(1, 1);
   CancelTouchPoint(0);
-  SendTouchEvent();
   EXPECT_EQ(0U, queued_event_count());
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
 }
 
 // Tests that followup events triggered by an immediate ack from
 // TouchEventQueue::QueueEvent() are properly handled.
 TEST_F(TouchEventQueueTest, ImmediateAckWithFollowupEvents) {
   // Create a touch event that will be queued synchronously by a touch ack.
   WebTouchEvent followup_event;
@@ skipping 16 matching lines @@
   EXPECT_EQ(1U, queued_event_count());
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
   EXPECT_EQ(INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS, acked_event_state());
   EXPECT_EQ(WebInputEvent::TouchMove, acked_event().type);
 }
 
 // Tests basic TouchEvent forwarding suppression.
 TEST_F(TouchEventQueueTest, NoTouchBasic) {
   // Disable TouchEvent forwarding.
-  set_no_touch_to_renderer(true);
+  SetEnableTouchForwarding(false);
   MoveTouchPoint(0, 30, 5);
-  SendTouchEvent();
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
 
   // TouchMove should not be sent to renderer.
   MoveTouchPoint(0, 65, 10);
-  SendTouchEvent();
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
 
   // TouchEnd should not be sent to renderer.
   ReleaseTouchPoint(0);
-  SendTouchEvent();
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
 
   // TouchStart should not be sent to renderer.
   PressTouchPoint(5, 5);
-  SendTouchEvent();
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
 
   // Enable TouchEvent forwarding.
-  set_no_touch_to_renderer(false);
+  SetEnableTouchForwarding(true);
 
   PressTouchPoint(80, 10);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
 
   MoveTouchPoint(0, 80, 20);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
 
   ReleaseTouchPoint(0);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
 }
 
 // Tests that no TouchEvents are sent to renderer during scrolling.
 TEST_F(TouchEventQueueTest, NoTouchOnScroll) {
   // Queue a TouchStart.
   PressTouchPoint(0, 1);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
 
   MoveTouchPoint(0, 20, 5);
-  SendTouchEvent();
   EXPECT_EQ(1U, queued_event_count());
   EXPECT_EQ(1U, GetAndResetSentEventCount());
 
   // Queue another TouchStart.
   PressTouchPoint(20, 20);
-  SendTouchEvent();
   EXPECT_EQ(2U, queued_event_count());
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(WebInputEvent::TouchStart, latest_event().type);
 
   // GestureScrollBegin inserts a synthetic TouchCancel before the TouchStart.
   WebGestureEvent followup_scroll;
   followup_scroll.type = WebInputEvent::GestureScrollBegin;
   SetFollowupEvent(followup_scroll);
-  ASSERT_FALSE(no_touch_to_renderer());
+  ASSERT_TRUE(WillForwardTouchEvents());
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
-  EXPECT_TRUE(no_touch_to_renderer());
+  EXPECT_FALSE(WillForwardTouchEvents());
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
   EXPECT_EQ(2U, queued_event_count());
   EXPECT_EQ(WebInputEvent::TouchCancel, sent_event().type);
   EXPECT_EQ(WebInputEvent::TouchStart, latest_event().type);
 
   // Acking the TouchCancel will result in dispatch of the next TouchStart.
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   // The synthetic TouchCancel should not reach client, only the TouchStart.
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(WebInputEvent::TouchStart, acked_event().type);
 
-  // TouchMove should not be sent to renderer.
+  // TouchMove should not be sent to the renderer.
   MoveTouchPoint(0, 30, 5);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS, acked_event_state());
 
   // GestureScrollUpdates should not change affect touch forwarding.
   SendGestureEvent(WebInputEvent::GestureScrollUpdate);
-  EXPECT_TRUE(no_touch_to_renderer());
+  EXPECT_FALSE(WillForwardTouchEvents());
 
-  // TouchEnd should not be sent to renderer.
+  // TouchEnd should not be sent to the renderer.
   ReleaseTouchPoint(0);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
   EXPECT_EQ(0U, GetAndResetSentEventCount());
   EXPECT_EQ(INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS, acked_event_state());
 
   // GestureScrollEnd will resume the sending of TouchEvents to renderer.
   SendGestureEvent(blink::WebInputEvent::GestureScrollEnd);
-  EXPECT_FALSE(no_touch_to_renderer());
+  EXPECT_TRUE(WillForwardTouchEvents());
 
   // Now TouchEvents should be forwarded normally.
   PressTouchPoint(80, 10);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
 
   MoveTouchPoint(0, 80, 20);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
 
   ReleaseTouchPoint(0);
-  SendTouchEvent();
   EXPECT_EQ(1U, GetAndResetSentEventCount());
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   EXPECT_EQ(1U, GetAndResetAckedEventCount());
 }
 
 // Tests that IsTouchStartPendingAck works correctly.
 TEST_F(TouchEventQueueTest, PendingStart) {
 
   EXPECT_FALSE(IsPendingAckTouchStart());
 
   // Send the touchstart for one point (#1).
   PressTouchPoint(1, 1);
-  SendTouchEvent();
   EXPECT_EQ(1U, queued_event_count());
   EXPECT_TRUE(IsPendingAckTouchStart());
 
   // Send a touchmove for that point (#2).
   MoveTouchPoint(0, 5, 5);
-  SendTouchEvent();
   EXPECT_EQ(2U, queued_event_count());
   EXPECT_TRUE(IsPendingAckTouchStart());
 
   // Ack the touchstart (#1).
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   EXPECT_EQ(1U, queued_event_count());
   EXPECT_FALSE(IsPendingAckTouchStart());
 
   // Send a touchstart for another point (#3).
   PressTouchPoint(10, 10);
-  SendTouchEvent();
   EXPECT_EQ(2U, queued_event_count());
   EXPECT_FALSE(IsPendingAckTouchStart());
 
   // Ack the touchmove (#2).
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   EXPECT_EQ(1U, queued_event_count());
   EXPECT_TRUE(IsPendingAckTouchStart());
 
   // Send a touchstart for a third point (#4).
   PressTouchPoint(15, 15);
-  SendTouchEvent();
   EXPECT_EQ(2U, queued_event_count());
   EXPECT_TRUE(IsPendingAckTouchStart());
 
   // Ack the touchstart for the second point (#3).
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   EXPECT_EQ(1U, queued_event_count());
   EXPECT_TRUE(IsPendingAckTouchStart());
 
   // Ack the touchstart for the third point (#4).
   SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   EXPECT_EQ(0U, queued_event_count());
   EXPECT_FALSE(IsPendingAckTouchStart());
 }
 
+// Tests that the touch timeout is started when sending certain touch types.
+TEST_F(TouchEventQueueTest, TouchTimeoutTypes) {
+  SetUpForTimeoutTesting(kDefaultTouchTimeoutDelayMs);
+
+  // Sending a TouchStart will start the timeout.
+  PressTouchPoint(0, 1);
+  EXPECT_TRUE(IsTimeoutRunning());
+  SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+  EXPECT_FALSE(IsTimeoutRunning());
+
+  // A TouchMove should start the timeout.
+  MoveTouchPoint(0, 5, 5);
+  EXPECT_TRUE(IsTimeoutRunning());
+  SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+  EXPECT_FALSE(IsTimeoutRunning());
+
+  // A TouchEnd should not start the timeout.
+  ReleaseTouchPoint(0);
+  EXPECT_FALSE(IsTimeoutRunning());
+  SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+  EXPECT_FALSE(IsTimeoutRunning());
+
+  // A TouchCancel should not start the timeout.
+  PressTouchPoint(0, 1);
+  SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+  ASSERT_FALSE(IsTimeoutRunning());
+  CancelTouchPoint(0);
+  EXPECT_FALSE(IsTimeoutRunning());
+  SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+  EXPECT_FALSE(IsTimeoutRunning());
+}
+
+// Tests that a delayed TouchEvent ack will trigger a TouchCancel timeout,
+// disabling touch forwarding until the next TouchStart is received after
+// the timeout events are ack'ed.
+TEST_F(TouchEventQueueTest, TouchTimeoutBasic) {
+  SetUpForTimeoutTesting(kDefaultTouchTimeoutDelayMs);
+
+  // Queue a TouchStart.
+  GetAndResetSentEventCount();
+  GetAndResetAckedEventCount();
+  PressTouchPoint(0, 1);
+  ASSERT_EQ(1U, GetAndResetSentEventCount());
+  ASSERT_EQ(0U, GetAndResetAckedEventCount());
+  EXPECT_TRUE(IsTimeoutRunning());
+  EXPECT_TRUE(WillForwardTouchEvents());
+
+  // Delay the ack.
+  base::MessageLoop::current()->PostDelayedTask(
+      FROM_HERE,
+      base::MessageLoop::QuitClosure(),
+      base::TimeDelta::FromMilliseconds(kDefaultTouchTimeoutDelayMs * 2));
+  base::MessageLoop::current()->Run();
+
+  // The timeout should have fired, synthetically ack'ing the timed-out event.
+  // TouchEvent forwarding is disabled until the ack is received for the
+  // timed-out event and the future cancel event.
+  EXPECT_FALSE(IsTimeoutRunning());
+  EXPECT_FALSE(WillForwardTouchEvents());
+  EXPECT_EQ(0U, GetAndResetSentEventCount());
+  EXPECT_EQ(1U, GetAndResetAckedEventCount());
+
+  // Ack'ing the original event should trigger a cancel event.
+  SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+  EXPECT_FALSE(IsTimeoutRunning());
+  EXPECT_FALSE(WillForwardTouchEvents());
+  EXPECT_EQ(0U, GetAndResetAckedEventCount());
+  EXPECT_EQ(1U, GetAndResetSentEventCount());
+
+  // Touch events should not be forwarded until we receive the cancel acks.
+  PressTouchPoint(0, 1);
+  ASSERT_EQ(0U, GetAndResetSentEventCount());
+  ASSERT_EQ(1U, GetAndResetAckedEventCount());
+
+  // The synthetic TouchCancel ack should not reach the client, but should
+  // resume touch forwarding.
+  SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+  EXPECT_EQ(0U, GetAndResetSentEventCount());
+  EXPECT_EQ(0U, GetAndResetAckedEventCount());
+  EXPECT_TRUE(WillForwardTouchEvents());
+
+  // Subsequent events should be handled normally.
+  PressTouchPoint(0, 1);
+  EXPECT_EQ(1U, GetAndResetSentEventCount());
+  EXPECT_EQ(0U, GetAndResetAckedEventCount());
+}
+
+// Tests that the timeout is never started if the renderer consumes
+// a TouchEvent from the current touch sequence.
+TEST_F(TouchEventQueueTest, NoTouchTimeoutIfRendererIsConsumingGesture) {
+  SetUpForTimeoutTesting(kDefaultTouchTimeoutDelayMs);
+
+  // Queue a TouchStart.
+  PressTouchPoint(0, 1);
+  ASSERT_TRUE(IsTimeoutRunning());
+
+  // Mark the event as consumed. This should prevent the timeout from
+  // being activated on subsequent TouchEvents in this gesture.
+  SendTouchEventACK(INPUT_EVENT_ACK_STATE_CONSUMED);
+  EXPECT_FALSE(IsTimeoutRunning());
+
+  // A TouchMove should not start the timeout.
+  MoveTouchPoint(0, 5, 5);
+  EXPECT_FALSE(IsTimeoutRunning());
+  SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+
+  // A secondary TouchStart should not start the timeout.
+  PressTouchPoint(1, 0);
+  EXPECT_FALSE(IsTimeoutRunning());
+  SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+
+  // A TouchEnd should not start the timeout.
+  ReleaseTouchPoint(1);
+  EXPECT_FALSE(IsTimeoutRunning());
+  SendTouchEventACK(INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+
+  // A TouchCancel should not start the timeout.
+  CancelTouchPoint(0);
+  EXPECT_FALSE(IsTimeoutRunning());
+}
+
+// Tests that the timeout is never started if the ack is synchronous.
+TEST_F(TouchEventQueueTest, NoTouchTimeoutIfAckIsSynchronous) {
+  SetUpForTimeoutTesting(kDefaultTouchTimeoutDelayMs);
+
+  // Queue a TouchStart.
+  SetSyncAckResult(INPUT_EVENT_ACK_STATE_CONSUMED);
+  ASSERT_FALSE(IsTimeoutRunning());
+  PressTouchPoint(0, 1);
+  EXPECT_FALSE(IsTimeoutRunning());
+}
+
+// Tests that a TouchCancel timeout plays nice when the timed out touch stream
+// turns into a scroll gesture sequence.
+TEST_F(TouchEventQueueTest, TouchTimeoutWithFollowupGesture) {
+  SetUpForTimeoutTesting(kDefaultTouchTimeoutDelayMs);
+
+  // Queue a TouchStart.
+  PressTouchPoint(0, 1);
+  EXPECT_TRUE(IsTimeoutRunning());
+  EXPECT_TRUE(WillForwardTouchEvents());
+  EXPECT_EQ(1U, GetAndResetSentEventCount());
+
+  // The cancelled sequence may turn into a scroll gesture.
+  WebGestureEvent followup_scroll;
+  followup_scroll.type = WebInputEvent::GestureScrollBegin;
+  SetFollowupEvent(followup_scroll);
+
+  // Delay the ack.
+  base::MessageLoop::current()->PostDelayedTask(
+      FROM_HERE,
+      base::MessageLoop::QuitClosure(),
+      base::TimeDelta::FromMilliseconds(kDefaultTouchTimeoutDelayMs * 2));
+  base::MessageLoop::current()->Run();
+
+  // The timeout should have fired, disabling touch forwarding until both acks
+  // are received, acking the timed out event.
+  EXPECT_FALSE(IsTimeoutRunning());
+  EXPECT_FALSE(WillForwardTouchEvents());
+  EXPECT_EQ(0U, GetAndResetSentEventCount());
+  EXPECT_EQ(1U, GetAndResetAckedEventCount());
+
+  // Ack the original event, triggering a TouchCancel.
+  SendTouchEventACK(INPUT_EVENT_ACK_STATE_CONSUMED);
+  EXPECT_FALSE(IsTimeoutRunning());
+  EXPECT_FALSE(WillForwardTouchEvents());
+  EXPECT_EQ(1U, GetAndResetSentEventCount());
+  EXPECT_EQ(0U, GetAndResetAckedEventCount());
+
+  // Ack the cancel event.  Normally, this would resume touch forwarding,
+  // but we're still within a scroll gesture so it remains disabled.
+  SendTouchEventACK(INPUT_EVENT_ACK_STATE_CONSUMED);
+  EXPECT_FALSE(IsTimeoutRunning());
+  EXPECT_FALSE(WillForwardTouchEvents());
+  EXPECT_EQ(0U, GetAndResetSentEventCount());
+  EXPECT_EQ(0U, GetAndResetAckedEventCount());
+
+  // Try to forward a touch event.
+  GetAndResetSentEventCount();
+  GetAndResetAckedEventCount();
+  PressTouchPoint(0, 1);
+  EXPECT_FALSE(IsTimeoutRunning());
+  EXPECT_EQ(0U, GetAndResetSentEventCount());
+  EXPECT_EQ(1U, GetAndResetAckedEventCount());
+
+  // Now end the scroll sequence, resuming touch handling.
+  SendGestureEvent(blink::WebInputEvent::GestureScrollEnd);
+  EXPECT_TRUE(WillForwardTouchEvents());
+  PressTouchPoint(0, 1);
+  EXPECT_TRUE(IsTimeoutRunning());
+  EXPECT_EQ(1U, GetAndResetSentEventCount());
+  EXPECT_EQ(0U, GetAndResetAckedEventCount());
+}
+
+// Tests that a TouchCancel timeout plays nice when the timed out touch stream
+// turns into a scroll gesture sequence, but the original event acks are
+// significantly delayed.
+TEST_F(TouchEventQueueTest, TouchTimeoutWithFollowupGestureAndDelayedAck) {
+  SetUpForTimeoutTesting(kDefaultTouchTimeoutDelayMs);
+
+  // Queue a TouchStart.
+  PressTouchPoint(0, 1);
+  EXPECT_TRUE(IsTimeoutRunning());
+  EXPECT_TRUE(WillForwardTouchEvents());
+  EXPECT_EQ(1U, GetAndResetSentEventCount());
+
+  // The cancelled sequence may turn into a scroll gesture.
+  WebGestureEvent followup_scroll;
+  followup_scroll.type = WebInputEvent::GestureScrollBegin;
+  SetFollowupEvent(followup_scroll);
+
+  // Delay the ack.
+  base::MessageLoop::current()->PostDelayedTask(
+      FROM_HERE,
+      base::MessageLoop::QuitClosure(),
+      base::TimeDelta::FromMilliseconds(kDefaultTouchTimeoutDelayMs * 2));
+  base::MessageLoop::current()->Run();
+
+  // The timeout should have fired, disabling touch forwarding until both acks
+  // are received and acking the timed out event.
+  EXPECT_FALSE(IsTimeoutRunning());
+  EXPECT_FALSE(WillForwardTouchEvents());
+  EXPECT_EQ(0U, GetAndResetSentEventCount());
+  EXPECT_EQ(1U, GetAndResetAckedEventCount());
+
+  // Try to forward a touch event.
+  GetAndResetSentEventCount();
+  GetAndResetAckedEventCount();
+  PressTouchPoint(0, 1);
+  EXPECT_FALSE(IsTimeoutRunning());
+  EXPECT_EQ(0U, GetAndResetSentEventCount());
+  EXPECT_EQ(1U, GetAndResetAckedEventCount());
+
+  // Now end the scroll sequence.  Events will not be forwarded until the two
+  // outstanding touch acks are received.
+  SendGestureEvent(blink::WebInputEvent::GestureScrollEnd);
+  PressTouchPoint(0, 1);
+  EXPECT_FALSE(IsTimeoutRunning());
+  EXPECT_EQ(0U, GetAndResetSentEventCount());
+  EXPECT_EQ(1U, GetAndResetAckedEventCount());
+
+  // Ack the original event, triggering a cancel.
+  SendTouchEventACK(INPUT_EVENT_ACK_STATE_CONSUMED);
+  EXPECT_EQ(1U, GetAndResetSentEventCount());
+  EXPECT_EQ(0U, GetAndResetAckedEventCount());
+
+  // Ack the cancel event, resuming touch forwarding.
+  SendTouchEventACK(INPUT_EVENT_ACK_STATE_CONSUMED);
+  EXPECT_EQ(0U, GetAndResetSentEventCount());
+  EXPECT_EQ(0U, GetAndResetAckedEventCount());
+
+  PressTouchPoint(0, 1);
+  EXPECT_TRUE(IsTimeoutRunning());
+  EXPECT_EQ(1U, GetAndResetSentEventCount());
+}
+
+// Tests that a delayed TouchEvent ack will not trigger a TouchCancel timeout if
+// the timed-out event had no consumer.
+TEST_F(TouchEventQueueTest, NoCancelOnTouchTimeoutWithoutConsumer) {
+  SetUpForTimeoutTesting(kDefaultTouchTimeoutDelayMs);
+
+  // Queue a TouchStart.
+  PressTouchPoint(0, 1);
+  ASSERT_EQ(1U, GetAndResetSentEventCount());
+  ASSERT_EQ(0U, GetAndResetAckedEventCount());
+  EXPECT_TRUE(IsTimeoutRunning());
+  EXPECT_TRUE(WillForwardTouchEvents());
+
+  // Delay the ack.
+  base::MessageLoop::current()->PostDelayedTask(
+      FROM_HERE,
+      base::MessageLoop::QuitClosure(),
+      base::TimeDelta::FromMilliseconds(kDefaultTouchTimeoutDelayMs * 2));
+  base::MessageLoop::current()->Run();
+
+  // The timeout should have fired, synthetically ack'ing the timed out event.
+  // TouchEvent forwarding is disabled until the original ack is received.
+  EXPECT_FALSE(IsTimeoutRunning());
+  EXPECT_FALSE(WillForwardTouchEvents());
+  EXPECT_EQ(0U, GetAndResetSentEventCount());
+  EXPECT_EQ(1U, GetAndResetAckedEventCount());
+
+  // Touch events should not be forwarded until we receive the original ack.
+  PressTouchPoint(0, 1);
+  ASSERT_EQ(0U, GetAndResetSentEventCount());
+  ASSERT_EQ(1U, GetAndResetAckedEventCount());
+
+  // Ack'ing the original event should not trigger a cancel event, as the
+  // TouchStart had no consumer.  However, it should re-enable touch forwarding.
+  SendTouchEventACK(INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS);
+  EXPECT_FALSE(IsTimeoutRunning());
+  EXPECT_TRUE(WillForwardTouchEvents());
+  EXPECT_EQ(0U, GetAndResetAckedEventCount());
+  EXPECT_EQ(0U, GetAndResetSentEventCount());
+
+  // Subsequent events should be handled normally.
+  PressTouchPoint(0, 1);
+  EXPECT_EQ(1U, GetAndResetSentEventCount());
+  EXPECT_EQ(0U, GetAndResetAckedEventCount());
+}
 }  // namespace content