linux aura: Support touch events.

ui/views/widget/desktop_aura/desktop_root_window_host_x11.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_X11_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_X11_H_
 
 #include <X11/Xlib.h>
 
 // Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
@@ skipping 162 matching lines @@
 
   // Called when another DRWHL takes capture, or when capture is released
   // entirely.
   void OnCaptureReleased();
 
   // Dispatches a mouse event, taking mouse capture into account. If a
   // different host has capture, we translate the event to its coordinate space
   // and dispatch it to that host instead.
   void DispatchMouseEvent(ui::MouseEvent* event);
 
+  // Dispatches a touch event, taking capture into account. If a different host
+  // has capture, then touch-press events are translated to its coordinate space
+  // and dispatched to that host instead.
+  void DispatchTouchEvent(ui::TouchEvent* event);
+
   // Resets the window region for the current widget bounds if necessary.
   void ResetWindowRegion();
 
   // Serializes an image to the format used by _NET_WM_ICON.
   void SerializeImageRepresentation(const gfx::ImageSkiaRep& rep,
                                     std::vector<unsigned long>* data);
 
   // See comment for variable open_windows_.
   static std::list<XID>& open_windows();
 
@@ skipping 80 matching lines @@
   // A list of all (top-level) windows that have been created but not yet
   // destroyed.
   static std::list<XID>* open_windows_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopRootWindowHostX11);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_X11_H_