Make first TouchStart and first TouchMove events on a flinging layer non-blocking

content/renderer/input/main_thread_event_queue_unittest.cc

 // Copyright 2016 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 <stddef.h>
 
 #include <new>
 #include <utility>
 #include <vector>
 
@@ skipping 223 matching lines @@
         WebInputEvent::DispatchType::ListenersNonBlockingPassive;
     EXPECT_EQ(coalesced_event, *last_wheel_event);
   }
   {
     EXPECT_EQ(kTouchEvents[0].size, handled_events_.at(1)->size);
     EXPECT_EQ(kTouchEvents[0].type, handled_events_.at(1)->type);
     const WebTouchEvent* last_touch_event =
         static_cast<const WebTouchEvent*>(handled_events_.at(1).get());
     WebTouchEvent coalesced_event = kTouchEvents[0];
     internal::Coalesce(kTouchEvents[1], &coalesced_event);
-    coalesced_event.dispatchType =
-        WebInputEvent::DispatchType::ListenersNonBlockingPassive;
+    coalesced_event.dispatchType = WebInputEvent::ListenersNonBlockingPassive;
     EXPECT_EQ(coalesced_event, *last_touch_event);
   }
 }
 
+TEST_F(MainThreadEventQueueTest, BlockingTouchesDuringFling) {
+  SyntheticWebTouchEvent kEvents[1];
+  kEvents[0].PressPoint(10, 10);
+  kEvents[0].touchStartOrFirstTouchMove = true;
+  queue_->set_is_flinging(true);
+
+  EXPECT_FALSE(main_task_runner_->HasPendingTask());
+  EXPECT_EQ(0u, event_queue().size());
+  HandleEvent(kEvents[0], INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+  EXPECT_EQ(1u, event_queue().size());
+  EXPECT_TRUE(main_task_runner_->HasPendingTask());
+  main_task_runner_->RunUntilIdle();
+  EXPECT_FALSE(main_task_runner_->HasPendingTask());
+  EXPECT_EQ(0u, event_queue().size());
+  EXPECT_EQ(1u, handled_events_.size());
+  EXPECT_EQ(kEvents[0].size, handled_events_.at(0)->size);
+  EXPECT_EQ(kEvents[0].type, handled_events_.at(0)->type);
+  const WebTouchEvent* last_touch_event =
+      static_cast<const WebTouchEvent*>(handled_events_.at(0).get());
+  kEvents[0].dispatchedDuringFling = true;
+  kEvents[0].dispatchType =
+      WebInputEvent::ListenersForcedNonBlockingPassiveDueToFling;
+  EXPECT_EQ(kEvents[0], *last_touch_event);
+
+  kEvents[0].MovePoint(0, 30, 30);
+  HandleEvent(kEvents[0], INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+  EXPECT_EQ(1u, event_queue().size());
+  EXPECT_TRUE(main_task_runner_->HasPendingTask());
+  main_task_runner_->RunUntilIdle();
+  EXPECT_FALSE(main_task_runner_->HasPendingTask());
+  EXPECT_EQ(0u, event_queue().size());
+  EXPECT_EQ(2u, handled_events_.size());
+  EXPECT_EQ(kEvents[0].size, handled_events_.at(1)->size);
+  EXPECT_EQ(kEvents[0].type, handled_events_.at(1)->type);
+  last_touch_event =
+      static_cast<const WebTouchEvent*>(handled_events_.at(1).get());
+  kEvents[0].dispatchedDuringFling = true;
+  kEvents[0].dispatchType =
+      WebInputEvent::ListenersForcedNonBlockingPassiveDueToFling;
+  EXPECT_EQ(kEvents[0], *last_touch_event);
+
+  kEvents[0].MovePoint(0, 50, 50);
+  kEvents[0].touchStartOrFirstTouchMove = false;
+  HandleEvent(kEvents[0], INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+  EXPECT_EQ(1u, event_queue().size());
+  EXPECT_TRUE(main_task_runner_->HasPendingTask());
+  main_task_runner_->RunUntilIdle();
+  EXPECT_FALSE(main_task_runner_->HasPendingTask());
+  EXPECT_EQ(0u, event_queue().size());
+  EXPECT_EQ(3u, handled_events_.size());
+  EXPECT_EQ(kEvents[0].size, handled_events_.at(2)->size);
+  EXPECT_EQ(kEvents[0].type, handled_events_.at(2)->type);
+  EXPECT_TRUE(kEvents[0].dispatchedDuringFling);
+  EXPECT_EQ(kEvents[0].dispatchType, WebInputEvent::Blocking);
+  last_touch_event =
+      static_cast<const WebTouchEvent*>(handled_events_.at(2).get());
+  EXPECT_EQ(kEvents[0], *last_touch_event);
+
+  kEvents[0].ReleasePoint(0);
+  HandleEvent(kEvents[0], INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+  EXPECT_EQ(1u, event_queue().size());
+  EXPECT_TRUE(main_task_runner_->HasPendingTask());
+  main_task_runner_->RunUntilIdle();
+  EXPECT_FALSE(main_task_runner_->HasPendingTask());
+  EXPECT_EQ(0u, event_queue().size());
+  EXPECT_EQ(4u, handled_events_.size());
+  EXPECT_EQ(kEvents[0].size, handled_events_.at(3)->size);
+  EXPECT_EQ(kEvents[0].type, handled_events_.at(3)->type);
+  EXPECT_TRUE(kEvents[0].dispatchedDuringFling);
+  EXPECT_EQ(kEvents[0].dispatchType, WebInputEvent::Blocking);
+  last_touch_event =
+      static_cast<const WebTouchEvent*>(handled_events_.at(3).get());
+  EXPECT_EQ(kEvents[0], *last_touch_event);
+}
+
 }  // namespace content