L1 System Lowered to L3 Still Requires Secure Decoders

Merge of https://widevine-internal-review.googlesource.com/#/c/8263
from the Widevine repo.

Changes the behavior of requiresSecureDecoderComponent() to query the
session for whether a lowered security level has been requested
before querying the system to see what its default security level is.

As part of this, we added a new QuerySessionStatus() method to the
CDM that gets status info on a session-specific level, such as the
effective security level of a session.

Bug: 11428937
Change-Id: I5549a2fdd400cc87f567d27fcf74c473451093d6

libwvdrmengine/mediacrypto/src/WVCryptoPlugin.cpp

@@ -50,7 +50,7 @@ bool WVCryptoPlugin::requiresSecureDecoderComponent(const char* mime) const {
     // Type is video, so query CDM to see if we require a secure decoder.
     CdmQueryMap status;
 
-    CdmResponseType res = mCDM->QueryStatus(&status);
+    CdmResponseType res = mCDM->QuerySessionStatus(mSessionId, &status);
 
     if (!isCdmResponseTypeSuccess(res)) {
       ALOGE("Error querying CDM status: %u", res);