win: Implement CrashpadClient::StartHandler()

util/win/exception_handler_server.h

Index: util/win/exception_handler_server.h
diff --git a/util/win/exception_handler_server.h b/util/win/exception_handler_server.h
index d1243406228e98b912d6b7699c7f1c2e2e7d2563..d4a81f16caf99796e2eb433c1987ee5524a05090 100644
--- a/util/win/exception_handler_server.h
+++ b/util/win/exception_handler_server.h
@@ -64,7 +64,10 @@ class ExceptionHandlerServer {
   //!
   //! \param[in] pipe_name The name of the pipe to listen on. Must be of the
   //!     form "\\.\pipe\<some_name>".
-  explicit ExceptionHandlerServer(const std::string& pipe_name);
+  //! \param[in] persistent `true` if Run() should not return until Stop() is
+  //!     called. If `false`, Run() will return when all clients have exited,
+  //!     although Run() will always wait for the first client to connect.
+  ExceptionHandlerServer(const std::string& pipe_name, bool persistent);
 
   ~ExceptionHandlerServer();
 
@@ -92,6 +95,8 @@ class ExceptionHandlerServer {
   base::Lock clients_lock_;
   std::set<internal::ClientData*> clients_;
 
+  bool persistent_;
+
   DISALLOW_COPY_AND_ASSIGN(ExceptionHandlerServer);
 };