Support InputRouter recycling

content/browser/renderer_host/input/gesture_event_queue_unittest.cc

Index: content/browser/renderer_host/input/gesture_event_queue_unittest.cc
diff --git a/content/browser/renderer_host/input/gesture_event_queue_unittest.cc b/content/browser/renderer_host/input/gesture_event_queue_unittest.cc
index 3fbae1ec4d27295ca5aee28a1459164cfa0c11ea..2aaf0a6584469a17d0f9185849d9f0def329c5af 100644
--- a/content/browser/renderer_host/input/gesture_event_queue_unittest.cc
+++ b/content/browser/renderer_host/input/gesture_event_queue_unittest.cc
@@ -1156,4 +1156,38 @@ TEST_F(GestureEventQueueTest, DebounceDropsDeferredEvents) {
   }
 }
 
+TEST_F(GestureEventQueueTest, RecycleDropsAllPendingEvents) {
+  SetUpForDebounce(3);
+
+  ASSERT_EQ(0U, GestureEventQueueSize());
+
+  SimulateGestureEvent(WebInputEvent::GestureScrollUpdate,
+                       blink::WebGestureDeviceTouchscreen);
+  EXPECT_EQ(1U, GetAndResetSentGestureEventCount());
+  EXPECT_EQ(1U, GestureEventQueueSize());
+  EXPECT_EQ(0U, GestureEventDebouncingQueueSize());
+  EXPECT_TRUE(ScrollingInProgress());
+
+  SimulateGestureEvent(WebInputEvent::GestureScrollEnd,
+                       blink::WebGestureDeviceTouchscreen);
+  EXPECT_EQ(0U, GetAndResetSentGestureEventCount());
+  EXPECT_EQ(1U, GestureEventQueueSize());
+  EXPECT_EQ(1U, GestureEventDebouncingQueueSize());
+
+  // Recycling the queue should clear all pending events and reset the state.
+  queue()->Recycle();
+  EXPECT_EQ(0U, GetAndResetSentGestureEventCount());
+  EXPECT_EQ(0U, GestureEventQueueSize());
+  EXPECT_EQ(0U, GestureEventDebouncingQueueSize());
+  EXPECT_FALSE(ScrollingInProgress());
+
+  // Subsequent events should work properly.
+  SimulateGestureEvent(WebInputEvent::GestureScrollUpdate,
+                       blink::WebGestureDeviceTouchscreen);
+  EXPECT_EQ(1U, GetAndResetSentGestureEventCount());
+  EXPECT_EQ(1U, GestureEventQueueSize());
+  EXPECT_EQ(0U, GestureEventDebouncingQueueSize());
+  EXPECT_TRUE(ScrollingInProgress());
+}
+
 }  // namespace content