Enabled/disable touch screen in TabletPowerButtonController

ash/shell/shell_delegate_impl.cc

Index: ash/shell/shell_delegate_impl.cc
diff --git a/ash/shell/shell_delegate_impl.cc b/ash/shell/shell_delegate_impl.cc
index 76e340fa4c5176516ff1e7a6f26b350e8ff5c5ff..b9c7c018c1ac6c3c1dba4fa063a2fdc031ee9f99 100644
--- a/ash/shell/shell_delegate_impl.cc
+++ b/ash/shell/shell_delegate_impl.cc
@@ -265,5 +265,15 @@ gfx::Image ShellDelegateImpl::GetDeprecatedAcceleratorImage() const {
   return gfx::Image();
 }
 
+bool ShellDelegateImpl::IsTouchscreenEnabledInPrefs(
+    bool use_local_state) const {
+  return true;
+}
+
+void ShellDelegateImpl::SetTouchscreenEnabledInPrefs(bool enabled,
+                                                     bool use_local_state) {}
+
+void ShellDelegateImpl::UpdateTouchscreenStatusFromPrefs() {}
+
 }  // namespace shell
 }  // namespace ash