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Some layout tests, e.g.
http/tests/navigation/no-referrer-target-blank.html create a new
process, and notifyDone() will be invoked in that new process. Add
support for forwarding that signal to the main test runner.

BUG=111316
R=mkwst@chromium.org
TEST=http/tests/navigation/no-referrer-target-blank.html does not time out

Review URL: https://codereview.chromium.org/13795002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@192819 0039d316-1c4b-4281-b951-d872f2087c98