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 241 matching lines @@
     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;
     EXPECT_EQ(coalesced_event, *last_touch_event);
   }
 }
 
+TEST_F(MainThreadEventQueueTest, BlockingTouchesDuringFling) {
+  SyntheticWebTouchEvent kEvents[1];
+  kEvents[0].PressPoint(10, 10);
+  queue_->set_is_flinging(true);
+
+  EXPECT_FALSE(main_task_runner_->HasPendingTask());
+  EXPECT_EQ(0u, event_queue().size());
+  queue_->HandleEvent(&kEvents[0], ui::LatencyInfo(), DISPATCH_TYPE_BLOCKING,
+                      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::DispatchType::ListenersForcedNonBlockingPassiveDueToFling;
+  EXPECT_EQ(kEvents[0], *last_touch_event);
+
+  kEvents[0].MovePoint(0, 30, 30);
+  queue_->HandleEvent(&kEvents[0], ui::LatencyInfo(), DISPATCH_TYPE_BLOCKING,
+                      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::DispatchType::ListenersForcedNonBlockingPassiveDueToFling;
+  EXPECT_EQ(kEvents[0], *last_touch_event);
+
+  kEvents[0].MovePoint(0, 50, 50);
+  queue_->HandleEvent(&kEvents[0], ui::LatencyInfo(), DISPATCH_TYPE_BLOCKING,
+                      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);
+  last_touch_event =

[dtapuska, 2016/08/10 14:47:42]

What are you expecting to have dispatchedDuringFling be here? We probably should
be testing that it doesn't get modified with a non-cancelable event?

Likely it is still taking on the last value in the previous test code because
you are re-using kEvents[0].

+      static_cast<const WebTouchEvent*>(handled_events_.at(2).get());
+  EXPECT_EQ(kEvents[0], *last_touch_event);
+
+  kEvents[0].ReleasePoint(0);
+  queue_->HandleEvent(&kEvents[0], ui::LatencyInfo(), DISPATCH_TYPE_BLOCKING,
+                      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);
+  last_touch_event =
+      static_cast<const WebTouchEvent*>(handled_events_.at(3).get());
+  EXPECT_EQ(kEvents[0], *last_touch_event);
+}
+
 }  // namespace content