Wheel scrolling with smooth scrolling enabled would cause an extra animation

ui/events/blink/input_handler_proxy_unittest.cc

 // Copyright 2013 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 "ui/events/blink/input_handler_proxy.h"
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/input/main_thread_scrolling_reason.h"
 #include "cc/trees/swap_promise_monitor.h"
@@ skipping 621 matching lines @@
 TEST_P(InputHandlerProxyTest, GestureScrollByCoarsePixels) {
 #else
 TEST_P(InputHandlerProxyTest, DISABLED_GestureScrollByCoarsePixels) {
 #endif
   SetSmoothScrollEnabled(true);
   expected_disposition_ = InputHandlerProxy::DID_HANDLE;
 
   gesture_.type = WebInputEvent::GestureScrollBegin;
   gesture_.data.scrollBegin.deltaHintUnits =
       WebGestureEvent::ScrollUnits::Pixels;
-  EXPECT_CALL(mock_input_handler_, ScrollAnimated(::testing::_, ::testing::_))
+  EXPECT_CALL(mock_input_handler_, ScrollBegin(::testing::_, ::testing::_))
       .WillOnce(testing::Return(kImplThreadScrollState));
+  EXPECT_CALL(mock_input_handler_, ScrollEnd(testing::_));
   EXPECT_EQ(expected_disposition_, input_handler_->HandleInputEvent(gesture_));
 
   gesture_.type = WebInputEvent::GestureScrollUpdate;
   gesture_.data.scrollUpdate.deltaUnits = WebGestureEvent::ScrollUnits::Pixels;
 
   EXPECT_CALL(mock_input_handler_, ScrollAnimated(::testing::_, ::testing::_))
       .WillOnce(testing::Return(kImplThreadScrollState));
   EXPECT_EQ(expected_disposition_, input_handler_->HandleInputEvent(gesture_));
 
   VERIFY_AND_RESET_MOCKS();
@@ skipping 2131 matching lines @@
   testing::Mock::VerifyAndClearExpectations(&mock_input_handler);
   testing::Mock::VerifyAndClearExpectations(&mock_client);
   testing::Mock::VerifyAndClearExpectations(&mock_synchronous_input_handler);
 }
 
 INSTANTIATE_TEST_CASE_P(AnimateInput,
                         InputHandlerProxyTest,
                         testing::ValuesIn(test_types));
 }  // namespace test
 }  // namespace ui