Update ui::PointerEvent to support mouse wheel and capture change events.

services/ui/ws/platform_display.cc

 // Copyright 2014 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 "services/ui/ws/platform_display.h"
 
 #include "base/numerics/safe_conversions.h"
 #include "build/build_config.h"
 #include "cc/ipc/quads.mojom.h"
 #include "cc/output/copy_output_request.h"
@@ skipping 193 matching lines @@
   frame_generator_->RequestRedraw(damaged_region);
 }
 
 void DefaultPlatformDisplay::DispatchEvent(ui::Event* event) {
   if (event->IsLocatedEvent())
     UpdateEventRootLocation(event->AsLocatedEvent());
 
   if (event->IsScrollEvent()) {
     // TODO(moshayedi): crbug.com/602859. Dispatch scroll events as
     // they are once we have proper support for scroll events.
-    delegate_->OnEvent(ui::MouseWheelEvent(*event->AsScrollEvent()));
-  } else if (event->IsMouseEvent() && !event->IsMouseWheelEvent()) {
+    delegate_->OnEvent(
+        ui::PointerEvent(ui::MouseWheelEvent(*event->AsScrollEvent())));
+  } else if (event->IsMouseEvent()) {
     delegate_->OnEvent(ui::PointerEvent(*event->AsMouseEvent()));
   } else if (event->IsTouchEvent()) {
     delegate_->OnEvent(ui::PointerEvent(*event->AsTouchEvent()));
   } else {
     delegate_->OnEvent(*event);
   }
 
 #if defined(USE_X11) || defined(USE_OZONE)
   // We want to emulate the WM_CHAR generation behaviour of Windows.
   //
@@ skipping 68 matching lines @@
   return delegate_ ? delegate_->IsInHighContrastMode() : false;
 }
 
 const ViewportMetrics& DefaultPlatformDisplay::GetViewportMetrics() {
   return metrics_;
 }
 
 }  // namespace ws
 
 }  // namespace ui