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This is helpful so that instead of adding new binaries for each different test suite that runs on its own bots (and so increading build times), we can still keep the tests in the same binaries. Instead, the specific bots would add --run-manual and can pass the test suite names as a command line flag.
Review URL: https://chromiumcodereview.appspot.com/10825311

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151212 0039d316-1c4b-4281-b951-d872f2087c98