MouseWheelEventQueue should respect ScrollBegin/End state from RenderWidgetHost.

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>
@@ skipping 123 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),
-        last_acked_event_state_(INPUT_EVENT_ACK_STATE_UNKNOWN) {
+        last_acked_event_state_(INPUT_EVENT_ACK_STATE_UNKNOWN),
+        is_in_gesture_scroll_(false) {
     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(
       const MouseWheelEventWithLatencyInfo& event) override {
     WebMouseWheelEvent* cloned_event = new WebMouseWheelEvent();
     std::unique_ptr<WebInputEvent> cloned_event_holder(cloned_event);
     *cloned_event = event.event;
     sent_events_.push_back(std::move(cloned_event_holder));
   }
 
   void ForwardGestureEventWithLatencyInfo(
       const blink::WebGestureEvent& event,
       const ui::LatencyInfo& latency_info) override {
     WebGestureEvent* cloned_event = new WebGestureEvent();
     std::unique_ptr<WebInputEvent> cloned_event_holder(cloned_event);
     *cloned_event = event;
     sent_events_.push_back(std::move(cloned_event_holder));
+
+    if (event.GetType() == blink::WebInputEvent::kGestureScrollBegin &&
+        !event.data.scroll_begin.synthetic) {
+      is_in_gesture_scroll_ = true;
+    } else if (event.GetType() == blink::WebInputEvent::kGestureScrollEnd &&
+               !event.data.scroll_end.synthetic) {
+      is_in_gesture_scroll_ = false;
+    }
   }
 
+  bool is_in_gesture_scroll() override { return is_in_gesture_scroll_; }
+
   void OnMouseWheelEventAck(const MouseWheelEventWithLatencyInfo& event,
                             InputEventAckState ack_result) override {
     ++acked_event_count_;
     last_acked_event_ = event.event;
     last_acked_event_state_ = ack_result;
   }
 
   base::TimeDelta DefaultScrollEndTimeoutDelay() {
     return base::TimeDelta::FromMilliseconds(scroll_end_timeout_ms_);
   }
@@ skipping 265 matching lines @@
   }
 
   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_;
+  bool is_in_gesture_scroll_;
 };
 
 // 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());
   EXPECT_TRUE(event_in_flight());
   EXPECT_EQ(1U, GetAndResetSentEventCount());
 
@@ skipping 236 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