Doc: SIGUSR1 needed when paused for debugger.

This clarifies the log message printed when a user passes
"--ppapi-startup-dialog" on the command line. It's not obvious how to unpause
the process without reading through the source.

BUG=78173


Review URL: https://chromiumcodereview.appspot.com/12624002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@186852 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed