Don't add offsets to ion handles

Fixes a secure buffer addressing offset error in the Widevine
CENC drm engine.

bug: 8667527

Merges the following from Widevine CDM repository:

Allow specification of offset into secure buffer
https://widevine-internal-review.googlesource.com/#/c/5100/

Update WVCryptoPlugin to Pass Output Offset as a Separate Parameter
https://widevine-internal-review.googlesource.com/#/c/5120/

Add offset to secure data buffer in OEMCrypto DecryptCTR
https://widevine-internal-review.googlesource.com/#/c/5110/

Change-Id: Ic3e4b35304c8fbae4aebe4c495285eb787e8c205

libwvdrmengine/cdm/core/src/cdm_engine.cpp

@@ -676,6 +676,7 @@ CdmResponseType CdmEngine::Decrypt(
     const std::vector<uint8_t>& iv,
     size_t block_offset,
     void* decrypt_buffer,
+    size_t decrypt_buffer_offset,
     bool is_video) {
   CdmSessionIter iter = sessions_.find(session_id);
   if (iter == sessions_.end()) {
@@ -685,7 +686,8 @@ CdmResponseType CdmEngine::Decrypt(
 
   return iter->second->Decrypt(is_encrypted, key_id, encrypt_buffer,
                                encrypt_length, iv, block_offset,
-                               decrypt_buffer, is_video);
+                               decrypt_buffer, decrypt_buffer_offset,
+                               is_video);
 }
 
 bool CdmEngine::IsKeyValid(const KeyId& key_id) {