Add initial support for handling touch events in desktop chrome AURA.

ui/views/widget/native_widget_win.cc

Index: ui/views/widget/native_widget_win.cc
===================================================================
--- ui/views/widget/native_widget_win.cc	(revision 174871)
+++ ui/views/widget/native_widget_win.cc	(working copy)
@@ -781,6 +781,11 @@
   return !!input_method;
 }
 
+bool NativeWidgetWin::HandleTouchEvent(const ui::TouchEvent& event) {
+  delegate_->OnTouchEvent(const_cast<ui::TouchEvent*>(&event));

[sky, 2013/01/07 15:53:45]

Does this mean windows is now going to start generating touch events? And won't
views get both a touch and mouse event?

[ananta, 2013/01/08 00:50:22]

As per our discussion, added checks in hwnd_message_handler to send touch events
only for AURA and to ignore Windows synthesized mouse messages.

+  return event.handled();
+}
+
 bool NativeWidgetWin::HandleIMEMessage(UINT message,
                                        WPARAM w_param,
                                        LPARAM l_param,