Move WebMouseWheelEvent into its own header file.

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 <memory>
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/test/histogram_tester.h"
 #include "base/test/scoped_feature_list.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "cc/input/main_thread_scrolling_reason.h"
 #include "cc/trees/swap_promise_monitor.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/public/platform/WebFloatPoint.h"
 #include "third_party/WebKit/public/platform/WebFloatSize.h"
 #include "third_party/WebKit/public/platform/WebGestureCurve.h"
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
+#include "third_party/WebKit/public/platform/WebMouseWheelEvent.h"
 #include "third_party/WebKit/public/platform/WebPoint.h"
 #include "ui/events/blink/blink_event_util.h"
 #include "ui/events/blink/compositor_thread_event_queue.h"
 #include "ui/events/blink/did_overscroll_params.h"
 #include "ui/events/blink/event_with_callback.h"
 #include "ui/events/blink/input_handler_proxy_client.h"
 #include "ui/events/blink/web_input_event_traits.h"
 #include "ui/events/latency_info.h"
 #include "ui/gfx/geometry/scroll_offset.h"
 #include "ui/gfx/geometry/size_f.h"
@@ skipping 3102 matching lines @@
   EXPECT_EQ(WebInputEvent::GesturePinchEnd, event_queue()[6]->event().type);
   testing::Mock::VerifyAndClearExpectations(&mock_input_handler_);
 }
 
 INSTANTIATE_TEST_CASE_P(AnimateInput,
                         InputHandlerProxyTest,
                         testing::ValuesIn(test_types));
 
 }  // namespace test
 }  // namespace ui