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/include/initialization_data.h

@@ -34,6 +34,7 @@ class InitializationData {
   CdmHlsMethod hls_method() const { return hls_method_; }
   std::vector<video_widevine::WidevinePsshData_EntitledKey> ExtractWrappedKeys()
       const;
+  bool contains_entitled_keys() const { return contains_entitled_keys_; }
 
  private:
   bool SelectWidevinePssh(const CdmInitData& init_data,
@@ -86,6 +87,7 @@ class InitializationData {
   bool is_hls_;
   bool is_webm_;
   bool is_audio_;
+  bool contains_entitled_keys_;
 
   std::vector<uint8_t> hls_iv_;
   CdmHlsMethod hls_method_;