Explicitly CHECK arguments in dbus::MessageWriter::AppendString/ObjectPath

dbus/object_path.h

 // 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.
 
 #ifndef DBUS_OBJECT_PATH_H_
 #define DBUS_OBJECT_PATH_H_
 #pragma once
 
 #include <string>
 
@@ skipping 11 matching lines @@
   //
   // The compiler synthesised copy constructor and assignment operator are
   // sufficient for our needs, as is implicit initialization of a std::string
   // from a string constant.
   ObjectPath() {}
   explicit ObjectPath(const std::string& value) : value_(value) {}
 
   // Retrieves value as a std::string.
   const std::string& value() const { return value_; }
 
+  // Returns true if the value is a valid object path.
+  bool IsValid() const;
+
   // Permit sufficient comparison to allow an ObjectPath to be used as a
   // key in a std::map.
   bool operator<(const ObjectPath&) const;
 
   // Permit testing for equality, required for mocks to work and useful for
   // observers.
   bool operator==(const ObjectPath&) const;
   bool operator!=(const ObjectPath&) const;
  private:
   std::string value_;
 };
 
 }  // namespace dbus
 
 #endif  // DBUS_OBJECT_PATH_H_