Adding timing information to the "pending callbacks" diagnostics. We've ran into cases where this would be useful.

BUG=164227
TEST=No

Review URL: https://codereview.chromium.org/76493003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236302 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed