crashpad_database_util: Accept --new-report=- to read a new report from standard input

tools/crashpad_database_util.ad

 // 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,
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 See also *--show-uploads-enabled*.
 
 *--set-last-upload-attempt-time*='TIME'::
 Set the last-upload-attempt time in the database’s settings. 'TIME' is a string
 representation of a time, which may be in 'yyyy-mm-dd hh:mm:ss' format, a
 numeric +time_t+ value, or the special string +"never"+.
 +
 See also *--show-last-upload-attempt-time*.
 
 *--new-report*='PATH'::
-Submit a new report located at 'PATH' to the database. The new report will be in
-the “pending” state. The UUID assigned to the new report will be printed. This
+Submit a new report located at 'PATH' to the database. If 'PATH' is +"-"+, the
+new report will be read from standard input. The new report will be in the
+“pending” state. The UUID assigned to the new report will be printed. This
 option may appear multiple times.
 
 *--utc*::
 When showing times, do so in UTC as opposed to the local time zone. When setting
 times, interpret ambiguous time strings in UTC as opposed to the local time
 zone.
 
 *--help*::
 Display help and exit.
 
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 Success.
 
 *1*::
 Failure, with a message printed to the standard error stream.
 
 == See Also
 
 man_link:crashpad_handler[8]
 
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