Add policy that forces SAML users to log in online periodically

This CL adds a user policy which limits the time for which a user
authenticated via SAML can log in offline. When the limit is reached, the
user is required to go through the online flow on next login.

BUG=332081
TEST=Full unit test and browser test coverage

Review URL: https://codereview.chromium.org/143463009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247984 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247984
evdev: Fix infinite loop when devices are unplugged

File descriptors that have become disconnected are always readable and
cause the UI thread to spin. Stop watching once we've encountered an
error.

Review URL: https://codereview.chromium.org/144233006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247985 0039d316-1c4b-4281-b951-d872f2087c98
[SyncFS] Disable quota management on tests

BUG=331988

Review URL: https://codereview.chromium.org/147843007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247986 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247986