cros: Default to natural scrolling if the internal diplay is a touchscreen.

ash/display/display_info.h

 // Copyright (c) 2013 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 ASH_DISPLAY_DISPLAY_INFO_H_
 #define ASH_DISPLAY_DISPLAY_INFO_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 71 matching lines @@
   // The name of the display.
   const std::string& name() const { return name_; }
 
   // True if the display EDID has the overscan flag. This does not create the
   // actual overscan automatically, but used in the message.
   bool has_overscan() const { return has_overscan_; }
 
   void set_rotation(gfx::Display::Rotation rotation) { rotation_ = rotation; }
   gfx::Display::Rotation rotation() const { return rotation_; }
 
+  void set_touch_support(gfx::Display::TouchSupport support) {
+    touch_support_ = support;
+  }
+  gfx::Display::TouchSupport touch_support() const { return touch_support_; }
+
   // Gets/Sets the device scale factor of the display.
   float device_scale_factor() const { return device_scale_factor_; }
   void set_device_scale_factor(float scale) { device_scale_factor_ = scale; }
 
   // The native bounds for the display. The size of this can be different from
   // the |size_in_pixel| when overscan insets are set and/or |ui_scale_| is set.
   const gfx::Rect bounds_in_native() const {
     return bounds_in_native_;
   }
 
@@ skipping 41 matching lines @@
 
   // Returns a string representation of the DisplayInfo
   // including resolutions.
   std::string ToFullString() const;
 
  private:
   int64 id_;
   std::string name_;
   bool has_overscan_;
   gfx::Display::Rotation rotation_;
+  gfx::Display::TouchSupport touch_support_;
 
   // This specifies the device's pixel density. (For example, a
   // display whose DPI is higher than the threshold is considered to have
   // device_scale_factor = 2.0 on Chrome OS).  This is used by the
   // grapics layer to choose and draw appropriate images and scale
   // layers properly.
   float device_scale_factor_;
   gfx::Rect bounds_in_native_;
 
   // The size of the display in use. The size can be different from the size
@@ skipping 12 matching lines @@
   bool native_;
 
   // The list of resolutions supported by this display.
   std::vector<Resolution> resolutions_;
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  //  ASH_DISPLAY_DISPLAY_INFO_H_