POSIX: add command line option to launch renderers in a wrapper

For example, ./Hammer/chrome --renderer-cmd-prefix="gdb --args"

Review URL: http://codereview.chromium.org/21190


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@9438 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed