Support InputRouter recycling

content/browser/renderer_host/input/gesture_event_queue_unittest.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 <vector>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 1138 matching lines @@
       WebInputEvent::GestureScrollUpdate,
       WebInputEvent::GestureScrollUpdate};
 
   for (unsigned i = 0; i < sizeof(expected) / sizeof(WebInputEvent::Type);
       i++) {
     WebGestureEvent merged_event = GestureEventQueueEventAt(i);
     EXPECT_EQ(expected[i], merged_event.type);
   }
 }
 
+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