Squashed commit of the following CDM changes:

* Add additional parameters to CDM decryption API
  https://widevine-internal-review.googlesource.com/#/c/6500/

* Pass Length and Flags Parameters to Decrypt()
  https://widevine-internal-review.googlesource.com/#/c/6740/

* Remove core files from oemcrypto/mock
  https://widevine-internal-review.googlesource.com/#/c/6853/

Change-Id: I1c73f5454da20da99130b161543fb990e16e7130

libwvdrmengine/cdm/core/include/crypto_session.h

@@ -68,15 +68,7 @@ class CryptoSession {
 
   // Media data path
   bool SelectKey(const std::string& key_id);
-  CdmResponseType Decrypt(bool is_encrypted,
-                          bool is_secure,
-                          const uint8_t* encrypt_buffer,
-                          size_t encrypt_length,
-                          const std::vector<uint8_t>& iv,
-                          size_t block_offset,
-                          void* decrypt_buffer,
-                          size_t decrypt_buffer_offset,
-                          bool is_video);
+  CdmResponseType Decrypt(const CdmDecryptionParameters& parameters);
 
   bool GetRandom(uint8_t* random_data, size_t data_length);