0ab787b95834b9103fb207c48dcca6fdc2ba9192
Adds a new property to the CDM's QueryStatus called QUERY_KEY_SYSTEM_ID that contains the System ID. (as read from OEMCrypto_GetKeyData) Adds a new property to the DrmPlugin (cleverly named "systemId") that allows the app to query for this. Also adds unit tests. Also changes the Device ID getter in crypto_engine.cpp to return a failure instead of an empty ID. Bug: 8621632 Merge of https://widevine-internal-review.googlesource.com/#/c/5010/ from widevine cdm repository to android repository. Change-Id: I8f309af18487c499e8ce25e829059e45623ea4dc
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