Implement device management policy cache.

This decodes the device management policy information and keeps a local cache of the policy  information on disk.

BUG=62036
TEST=unit tests

Review URL: http://codereview.chromium.org/4338004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@65208 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 78c83cb..22884387 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -2412,6 +2412,8 @@
         'browser/policy/device_management_backend.h',
         'browser/policy/device_management_backend_impl.cc',
         'browser/policy/device_management_backend_impl.h',
+        'browser/policy/device_management_policy_cache.cc',
+        'browser/policy/device_management_policy_cache.h',
         'browser/policy/device_token_fetcher.cc',
         'browser/policy/device_token_fetcher.h',
         'browser/policy/dummy_configuration_policy_provider.h',