Allow license renewals after expiry

Licenses could be renewed uptil the point of expiry. After that point
we expected that the session would have to be closed and a new one
opened with a new license loaded. Clank requested that we support
renewal of sessions past expiry.

In addition, the error returned on decryption, if OEMCrypto
determines that the KCB duration has expired, is NEED_KEY rather than
KEY_ERROR.

Merge of https://widevine-internal-review.googlesource.com/#/c/8240
from the widevine cdm repo.

b/11390539

Change-Id: I023320f3f25514cd07b368701a92100429ce1c04

libwvdrmengine/cdm/core/src/cdm_session.cpp

@@ -272,7 +272,17 @@ CdmResponseType CdmSession::Decrypt(const CdmDecryptionParameters& params) {
   if (crypto_session_.get() == NULL || !crypto_session_->IsOpen())
     return UNKNOWN_ERROR;
 
-  return crypto_session_->Decrypt(params);
+  CdmResponseType status = crypto_session_->Decrypt(params);
+  // TODO(rfrias): Remove after support for OEMCrypto_ERROR_KEY_EXPIRED is in
+  if (UNKNOWN_ERROR == status) {
+    Clock clock;
+    int64_t current_time = clock.GetCurrentTime();
+    if (policy_engine_.IsLicenseDurationExpired(current_time) ||
+        policy_engine_.IsPlaybackDurationExpired(current_time)) {
+      return NEED_KEY;
+    }
+  }
+  return status;
 }
 
 // License renewal