Add on_demand_service_tool

tools/tool_support.h

Index: tools/tool_support.h
diff --git a/tools/tool_support.h b/tools/tool_support.h
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+++ b/tools/tool_support.h
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+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_TOOLS_TOOL_SUPPORT_H_
+#define CRASHPAD_TOOLS_TOOL_SUPPORT_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+
+namespace crashpad {
+
+//! \brief Common functions used by command line tools.
+class ToolSupport {
+ public:
+  //! \brief Handles `--version`.
+  //!
+  //! \param[in] me The tool’s name, the basename of `argv[0]`.
+  static void Version(const std::string& me);
+
+  //! \brief Prints the footer for `--help`.
+  //!
+  //! \param[in] me The tool’s name, the basename of `argv[0]`.
+  static void UsageTail(const std::string& me);
+
+  //! \brief Suggests using `--help` when a command line tool can’t make sense
+  //!     of its arguments.
+  //!
+  //! \param[in] me The tool’s name, the basename of `argv[0]`.
+  static void UsageHint(const std::string& me, const char* hint);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(ToolSupport);
+};
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_TOOLS_TOOL_SUPPORT_H_