Handle key rotation

[ Merge of http://go/wvgerrit/77049 ]

Entitlement PSSHs can now be provided in follow on key generation
requests to cause keys to be rotated without needing a license
exchange.

Bug: 128462397
Test: WV unit/integration tests, Netflix and GPlay tests,
      GtsMediaDrmTests

Change-Id: I6ed0901a35c498240f42e405a522d82ea8dce2f7

libwvdrmengine/cdm/core/src/cdm_session.cpp

@@ -439,8 +439,13 @@ CdmResponseType CdmSession::GenerateKeyRequestInternal(
 
   if (is_release_) {
     return GenerateReleaseRequest(key_request);
-  } else if (license_received_) {  // renewal
-    return GenerateRenewalRequest(key_request);
+  } else if (license_received_) {
+    // A call to GenerateKeyRequest after the initial license has been received
+    // is either a renewal request or a key rotation event
+    if (init_data.contains_entitled_keys())
+      return license_parser_->HandleEmbeddedKeyData(init_data);
+    else
+      return GenerateRenewalRequest(key_request);
   } else {
     key_request->type = kKeyRequestTypeInitial;