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

ui/gfx/display.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 "ui/gfx/display.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 39 matching lines @@
 }
 
 //static
 bool Display::HasForceDeviceScaleFactor() {
   return HasForceDeviceScaleFactorImpl();
 }
 
 Display::Display()
     : id_(kInvalidDisplayID),
       device_scale_factor_(GetForcedDeviceScaleFactor()),
-      rotation_(ROTATE_0) {
+      rotation_(ROTATE_0),
+      touch_support_(TOUCH_SUPPORT_UNKNOWN) {
 }
 
 Display::Display(int64 id)
     : id_(id),
       device_scale_factor_(GetForcedDeviceScaleFactor()),
-      rotation_(ROTATE_0) {
+      rotation_(ROTATE_0),
+      touch_support_(TOUCH_SUPPORT_UNKNOWN) {
 }
 
 Display::Display(int64 id, const gfx::Rect& bounds)
     : id_(id),
       bounds_(bounds),
       work_area_(bounds),
       device_scale_factor_(GetForcedDeviceScaleFactor()),
-      rotation_(ROTATE_0) {
+      rotation_(ROTATE_0),
+      touch_support_(TOUCH_SUPPORT_UNKNOWN) {
 #if defined(USE_AURA)
   SetScaleAndBounds(device_scale_factor_, bounds);
 #endif
 }
 
 Display::~Display() {
 }
 
 Insets Display::GetWorkAreaInsets() const {
   return gfx::Insets(work_area_.y() - bounds_.y(),
@@ skipping 58 matching lines @@
 
 int64 Display::InternalDisplayId() {
   return internal_display_id_;
 }
 
 void Display::SetInternalDisplayId(int64 internal_display_id) {
   internal_display_id_ = internal_display_id;
 }
 
 }  // namespace gfx