Fixed failing content_browsertests when async wheel events is on.

content/browser/pointer_lock_browsertest.cc

 // Copyright 2017 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/pointer_lock_browsertest.h"
 
 #include "content/browser/frame_host/frame_tree.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_input_event_router.h"
 #include "content/browser/web_contents/web_contents_impl.h"
@@ skipping 328 matching lines @@
       "function(e) {x = e.x; y = e.y; dX = e.deltaX; dY = e.deltaY;});"));
   MainThreadFrameObserver root_observer(root_view->GetRenderWidgetHost());
   root_observer.Wait();
 
   blink::WebMouseWheelEvent wheel_event(
       blink::WebInputEvent::kMouseWheel, blink::WebInputEvent::kNoModifiers,
       blink::WebInputEvent::kTimeStampForTesting);
   wheel_event.SetPositionInWidget(10, 11);
   wheel_event.delta_x = -12;
   wheel_event.delta_y = -13;
+  wheel_event.phase = blink::WebMouseWheelEvent::kPhaseBegan;
   router->RouteMouseWheelEvent(root_view, &wheel_event, ui::LatencyInfo());
 
   // Make sure that the renderer handled the input event.
   root_observer.Wait();
 
   int x, y, deltaX, deltaY;
   EXPECT_TRUE(ExecuteScriptAndExtractInt(
       root, "window.domAutomationController.send(x);", &x));
   EXPECT_TRUE(ExecuteScriptAndExtractInt(
       root, "window.domAutomationController.send(y);", &y));
@@ skipping 51 matching lines @@
       child, "window.domAutomationController.send(dX);", &deltaX));
   EXPECT_TRUE(ExecuteScriptAndExtractInt(
       child, "window.domAutomationController.send(dY);", &deltaY));
   EXPECT_EQ(14, x);
   EXPECT_EQ(15, y);
   EXPECT_EQ(16, deltaX);
   EXPECT_EQ(17, deltaY);
 }
 
 }  // namespace content