Use ScopedTaskEnvironment instead of MessageLoopForUI in content tests.

content/browser/renderer_host/input/mouse_wheel_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 "content/browser/renderer_host/input/mouse_wheel_event_queue.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <utility>
 
 #include "base/location.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "content/browser/renderer_host/input/timeout_monitor.h"
 #include "content/common/input/synthetic_web_input_event_builders.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
 #include "ui/events/base_event_utils.h"
 
 using blink::WebGestureEvent;
 using blink::WebInputEvent;
 using blink::WebMouseWheelEvent;
@@ skipping 107 matching lines @@
 
 #define EXPECT_MOUSE_WHEEL(event) \
   EXPECT_EQ(WebInputEvent::kMouseWheel, event->GetType());
 
 }  // namespace
 
 class MouseWheelEventQueueTest : public testing::TestWithParam<bool>,
                                  public MouseWheelEventQueueClient {
  public:
   MouseWheelEventQueueTest()
-      : acked_event_count_(0),
+      : scoped_task_environment_(
+            base::test::ScopedTaskEnvironment::MainThreadType::UI),
+        acked_event_count_(0),
         last_acked_event_state_(INPUT_EVENT_ACK_STATE_UNKNOWN) {
     scroll_latching_enabled_ = GetParam();
     queue_.reset(new MouseWheelEventQueue(this, scroll_latching_enabled_));
     scroll_end_timeout_ms_ = scroll_latching_enabled_ ? 100 : 0;
   }
 
   ~MouseWheelEventQueueTest() override {}
 
   // MouseWheelEventQueueClient
   void SendMouseWheelEventImmediately(
@@ skipping 283 matching lines @@
       EXPECT_INERTIAL_GESTURE_SCROLL_END(sent_gesture_event(0));
       EXPECT_EQ(1U, GetAndResetSentEventCount());
     } else {
       EXPECT_EQ(2U, all_sent_events().size());
       EXPECT_SYNTHETIC_INERTIAL_GESTURE_SCROLL_BEGIN(sent_gesture_event(0));
       EXPECT_INERTIAL_GESTURE_SCROLL_END(sent_gesture_event(1));
       EXPECT_EQ(2U, GetAndResetSentEventCount());
     }
   }
 
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   std::unique_ptr<MouseWheelEventQueue> queue_;
   std::vector<std::unique_ptr<WebInputEvent>> sent_events_;
   size_t acked_event_count_;
   InputEventAckState last_acked_event_state_;
-  base::MessageLoopForUI message_loop_;
   WebMouseWheelEvent last_acked_event_;
   int64_t scroll_end_timeout_ms_;
   bool scroll_latching_enabled_;
 };
 
 // Tests that mouse wheel events are queued properly.
 TEST_P(MouseWheelEventQueueTest, Basic) {
   SendMouseWheel(kWheelScrollX, kWheelScrollY, kWheelScrollGlobalX,
                  kWheelScrollGlobalY, 1, 1, 0, false);
   EXPECT_EQ(0U, queued_event_count());
@@ skipping 239 matching lines @@
   EXPECT_EQ(0U, sent_gesture_event(0)->data.scroll_update.delta_x);
   EXPECT_EQ(1U, sent_gesture_event(0)->data.scroll_update.delta_y);
   EXPECT_EQ(1U, GetAndResetSentEventCount());
 }
 
 INSTANTIATE_TEST_CASE_P(MouseWheelEventQueueTests,
                         MouseWheelEventQueueTest,
                         testing::Bool());
 
 }  // namespace content