Merge changes I2b40afb7,I66c6e331,I6be3d49e,I4970d230

* changes:
  [CallingIdentityTokenDetector] Support methods with implicit receiver
  Enable Android Lint tests for AndroidFrameworkLintChecker
  Moved issues/IssueRegistry to mimic AS convention + README for AndroidFrameworkLintChecker
  Rename AndroidFrameworkLintChecker's package to com.google.android.lint