The CDM may use the eventing mechanism or the error return-value mechanism to
notify callers of errors that the Java APIs expect to be passed via the
eventing mechanism. We need to detect when an error has been synchronously
returned via the error return value of a method and fire an appropriate event.
bug: 8620943
Merge of https://widevine-internal-review.googlesource.com/#/c/5261/
from the Widevine CDM repo.
Change-Id: I2055854dc960845dc775b1fceab9d0850b63fbb5
187d3e94e8