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[sync] Add a polling mechanism to CredentialCacheService for on-the-fly sign in / sign out / reconfigure detection

With sync credential caching on Win 8, if Metro and Desktop are both
running at the same time, and the user signs in / signs out / reconfigures
sync in one mode, the other mode gets updated only after restart.

This patch implements a polling mechanism to enable first-time
auto-sign-in, first time auto-sign-out, and sync setting / credential
reconfigurations without the need for browser restart.

BUG=139200
TEST=Launch clean Desktop and Metro chrome, sign in / sign out / reconfigure one mode, watch for a minute and the other mode should catch up

Review URL: https://chromiumcodereview.appspot.com/10828108

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150001 0039d316-1c4b-4281-b951-d872f2087c98