Before this change, the commit message only contains issue number and
patchset number. Adding CL description should be more informative.

Review URL: https://codereview.chromium.org/1128473003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@295449 0039d316-1c4b-4281-b951-d872f2087c98