Add logging to diagnose feedback issues.
Add logging to diagnose a hard to reproduce issue with the feedback UI not launching on auto-updated machines.

R=asargent@chromium.org, xiyuan@chromium.org
BUG=284662

Review URL: https://codereview.chromium.org/27423002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228852 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228852
Start counting frames that are dropped before being painted.

BUG=291731

Review URL: https://codereview.chromium.org/26880002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228853 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228853