Enabled/disable touch screen in TabletPowerButtonController

ash/shell/shell_delegate_impl.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/shell/shell_delegate_impl.h"
 
 #include "ash/app_list/app_list_presenter_delegate_factory.h"
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/default_accessibility_delegate.h"
 #include "ash/common/gpu_support_stub.h"
@@ skipping 247 matching lines @@
 }
 
 base::string16 ShellDelegateImpl::GetProductName() const {
   return base::string16();
 }
 
 gfx::Image ShellDelegateImpl::GetDeprecatedAcceleratorImage() const {
   return gfx::Image();
 }
 
+bool ShellDelegateImpl::IsTouchscreenEnabledInPrefs(bool is_local) const {
+  return true;

[Daniel Erat, 2016/12/02 21:48:56]

should these have NOTIMPLEMENTED() as well? i think we usually use
NOTIMPLEMENTED() for methods that aren't implemented yet but that should be in
the future (i believe the macro was introduced when porting chrome to
non-windows platforms). is that the case here, or will these never be
implemented?

[Qiang(Joe) Xu, 2016/12/02 23:55:10]

I think they will never be implemented here as this method needs chrome/browser
dependency.

+}
+
+void ShellDelegateImpl::SetTouchscreenEnabledInPrefs(bool enabled,
+                                                     bool is_local) {}
+
+void ShellDelegateImpl::UpdateTouchscreenStatusFromPrefs() {}
+
 }  // namespace shell
 }  // namespace ash