win: Implement CrashpadClient::StartHandler()

util/win/command_line.h

Index: util/win/command_line.h
diff --git a/util/win/command_line.h b/util/win/command_line.h
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index 0000000000000000000000000000000000000000..eb3f71244d67da1858669777b466f51170fe9740
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+++ b/util/win/command_line.h
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+// Copyright 2015 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_UTIL_WIN_COMMAND_LINE_H_
+#define CRASHPAD_UTIL_WIN_COMMAND_LINE_H_
+
+#include <string>
+
+namespace crashpad {
+
+//! \brief Utility function for building escaped command lines.
+//!
+//! This builds a command line so that individual arguments can be reliably
+//! decoded by `CommandLineToArgvW()`.
+//!
+//! \a argument is appended to \a command_line. If necessary, it will be placed
+//! in quotation marks and escaped properly. If \a command_line is initially
+//! non-empty, a space will precede \a argument.
+//!
+//! \param[in] argument The argument to append to \a command_line.
+//! \param[inout] command_line The command line being constructed.
+void AppendCommandLineArgument(const std::wstring& argument,
+                               std::wstring* command_line);
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_UTIL_WIN_COMMAND_LINE_H_