Add cipher mode and pattern encryption support

[ Merge of http://go/wvgerrit/16364 ]

http://go/wvgerrit/16249 changed the name of the encryption pattern
structure from OEMCrypto_PatternDesc to OEMCrypto_CENCEncryptPatternDesc
to remove ambiguity. These are matching changes to CDM core.

[ Merge of http://go/wvgerrit/16340 ]

This CL passes the cipher mode in the license to OEMCrypto when
keys are loaded and specifies the pattern encryption scheme to
OEMCrypto_DecryptCENC.

b/20630275

Change-Id: I86b82bbdc891fd0100beb9fad385ca2082176271

libwvdrmengine/cdm/core/include/crypto_key.h

@@ -17,6 +17,7 @@ class CryptoKey {
   const std::string& key_data_iv() const { return key_data_iv_; }
   const std::string& key_control() const { return key_control_; }
   const std::string& key_control_iv() const { return key_control_iv_; }
+  CdmCipherMode cipher_mode() const { return cipher_mode_; }
   void set_key_id(const std::string& key_id) { key_id_ = key_id; }
   void set_key_data(const std::string& key_data) { key_data_ = key_data; }
   void set_key_data_iv(const std::string& iv) { key_data_iv_ = iv; }
@@ -24,6 +25,9 @@ class CryptoKey {
   void set_key_control_iv(const std::string& ctl_iv) {
     key_control_iv_ = ctl_iv;
   }
+  void set_cipher_mode(CdmCipherMode cipher_mode) {
+    cipher_mode_ = cipher_mode;
+  }
 
   bool HasKeyControl() const { return key_control_.size() >= 16; }
 
@@ -33,6 +37,7 @@ class CryptoKey {
   std::string key_data_;
   std::string key_control_;
   std::string key_control_iv_;
+  CdmCipherMode cipher_mode_;
 };
 
 }  // namespace wvcdm