Cache force-installed apps/extensions in device-local accounts
This CL adds the DeviceLocalAccountExternalPolicyLoader, a replacement for
the ExternalPolicyLoader that caches force-installed apps/extensions,
allowing them to be installed offline. The caches for individual accounts
are managed by the DeviceLocalAccountPolicyService which makes sure to
remove obsolete cache directories.
BUG=287802
TEST=Full coverage with new browser and unit tests
Review URL: https://codereview.chromium.org/
27548004
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229896 0039d316-1c4b-4281-b951-d872f2087c98