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This patch fixes various problems in the bisect scripts that were
preventing their use for Chrome for Android. I have only tried these
using run-manual-bisect-test, and there could potentially be
further problems with bisect wrapper scripts.

Also fixes the --use-goma option to actually use Goma, rather than
simply increasing the number of threads.

BUG=none

Review URL: https://codereview.chromium.org/331593007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278082 0039d316-1c4b-4281-b951-d872f2087c98