telemetry: Added schedule check to r_and_r_micro

This patch adds a check that a benchmark is successfully scheduled.
Without it, we may simply timeout which makes the problem harder
to diagnose.

R=ernstm@chromium.org

Review URL: https://codereview.chromium.org/106743009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239356 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239356
Add flag to enable print preview registration promos

Add flag to enable/disable registration promos in print preview.

BUG=326718

Review URL: https://codereview.chromium.org/106983005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239357 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239357