aura: Add mouse wheel event support for x11 in RWHVA.

content/browser/renderer_host/web_input_event_aurax11.cc

 // Copyright (c) 2011 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.
 
 // Portions based heavily on:
 // third_party/WebKit/Source/WebKit/chromium/public/gtk/WebInputEventFactory.cpp
 //
 /*
  * Copyright (C) 2006-2011 Google Inc. All rights reserved.
  *
@@ skipping 236 matching lines @@
       NOTIMPLEMENTED() << "Received unexpected event: " << event->type();
       break;
   }
 
   return webkit_event;
 }
 
 WebKit::WebMouseWheelEvent MakeWebMouseWheelEventFromAuraEvent(
     aura::MouseEvent* event) {
   WebKit::WebMouseWheelEvent webkit_event;
-  // TODO(sadrul): !
+
+  webkit_event.type = WebKit::WebInputEvent::MouseWheel;
+  webkit_event.button = WebKit::WebMouseEvent::ButtonNone;
+  webkit_event.modifiers = EventFlagsToWebEventModifiers(event->flags());
+  webkit_event.timeStampSeconds = event->time_stamp().ToDoubleT();
+  webkit_event.deltaY = ui::GetMouseWheelOffset(event->native_event());
+  webkit_event.wheelTicksY = webkit_event.deltaY > 0 ? 1 : -1;
+
   return webkit_event;
 }
 
 WebKit::WebKeyboardEvent MakeWebKeyboardEventFromAuraEvent(
     aura::KeyEvent* event) {
   base::NativeEvent native_event = event->native_event();
   WebKit::WebKeyboardEvent webkit_event;
   XKeyEvent* native_key_event = &native_event->xkey;
 
   webkit_event.timeStampSeconds =
@@ skipping 38 matching lines @@
   }
 
   webkit_event.setKeyIdentifierFromWindowsKeyCode();
 
   // TODO: IsAutoRepeat/IsKeyPad?
 
   return webkit_event;
 }
 
 }  // namespace content