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

ash/display/display_manager.cc

 // 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.
 
 #include "ash/display/display_manager.h"
 
 #include <cmath>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 880 matching lines @@
 
   gfx::Display new_display(display_info.id());
   gfx::Rect bounds_in_native(display_info.size_in_pixel());
 
   // Simply set the origin to (0,0).  The primary display's origin is
   // always (0,0) and the secondary display's bounds will be updated
   // in |UpdateSecondaryDisplayBoundsForLayout| called in |UpdateDisplay|.
   new_display.SetScaleAndBounds(
       display_info.device_scale_factor(), gfx::Rect(bounds_in_native.size()));
   new_display.set_rotation(display_info.rotation());
+  new_display.set_touch_support(display_info.touch_support());
   return new_display;
 }
 
 bool DisplayManager::UpdateSecondaryDisplayBoundsForLayout(
     DisplayList* displays,
     size_t* updated_index) const {
   if (displays->size() != 2U)
     return false;
 
   int64 id_at_zero = displays->at(0).id();
@@ skipping 71 matching lines @@
       break;
   }
   gfx::Insets insets = secondary_display->GetWorkAreaInsets();
   secondary_display->set_bounds(
       gfx::Rect(new_secondary_origin, secondary_bounds.size()));
   secondary_display->UpdateWorkAreaFromInsets(insets);
 }
 
 }  // namespace internal
 }  // namespace ash