GTTF: Limit number of retried tests.

Since the retries are serial and without batching multiple tests into
the same process, they are quite slow. With lots of retries total test
run time can easily be in hours.

BUG=236893
R=sky@chromium.org

Review URL: https://codereview.chromium.org/115233007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241243 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241243
manifest.json for GetHelp M33 release

BUG=chromium:327996

Review URL: https://codereview.chromium.org/100213005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241244 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241244
TSan v2 suppressions:
 - false positive in PR_Lock (issue 328868)
 - race in SamplingStateScope::set() (issue 258479)

BUG=328868,258479
TBR=zhaoqin@chromium.org

Review URL: https://codereview.chromium.org/115933006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241246 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241246