Corrected a regression in error event reporting and a mismatch in asset paths during rights acquisition. Also requires https://android-git.corp.google.com/g/#/c/185898/ Contains Widevine libraries version 6.0.0-6957 Change-Id: I4a7603a86feaf437673fc73f0cccb6065dbcce67 related-to-bug: 6414503