tree 9f2fd796b60f4c7aa92063852a8691b7d258dbcb
parent 68ff8650552ea890745a0d65393bdd50f680d315
author Glenn Lewis <gmlewis@google.com> 1412315090 -0700
committer Glenn Lewis <gmlewis@google.com> 1414796643 -0700

Locally cache oauth tokens.
This change is for both App Engine and Managed VMs so that these apps can scale without running into the app_identity_service quota limit due to calling appengine.AccessToken too frequently.  An added benefit of caching is that calls to Google APIs will be significantly sped up due to removing the round-trip calls to the api_identity_service.