Using instrumented.identity.onSignInChanged to track signed-in state changes.

BUG=164227
TEST=No

Review URL: https://codereview.chromium.org/35413005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230910 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed