Add persisted preference for projection touch HUD

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 <limits>
 
 #include "ash/caps_lock_delegate_stub.h"
 #include "ash/host/root_window_host_factory.h"
@@ skipping 242 matching lines @@
 }
 
 RootWindowHostFactory* ShellDelegateImpl::CreateRootWindowHostFactory() {
   return RootWindowHostFactory::Create();
 }
 
 base::string16 ShellDelegateImpl::GetProductName() const {
   return base::string16();
 }
 
+bool ShellDelegateImpl::IsTouchHudProjectionEnabled() const {
+  return false;
+}
+
+void ShellDelegateImpl::ToggleTouchHudProjection() {
+}
+
 }  // namespace shell
 }  // namespace ash