Generalize Pepper CDM API decrypt and decode.

ppapi/proxy/ppp_content_decryptor_private_proxy.h

Index: ppapi/proxy/ppp_content_decryptor_private_proxy.h
diff --git a/ppapi/proxy/ppp_content_decryptor_private_proxy.h b/ppapi/proxy/ppp_content_decryptor_private_proxy.h
index facec10fc7bb928fbd3861e46c9970c3e2165d9b..337196b8a228b56e318934770ed1d91e7d0e8d21 100644
--- a/ppapi/proxy/ppp_content_decryptor_private_proxy.h
+++ b/ppapi/proxy/ppp_content_decryptor_private_proxy.h
@@ -52,10 +52,11 @@ class PPP_ContentDecryptor_Private_Proxy : public InterfaceProxy {
   void OnMsgResetDecoder(PP_Instance instance,
                          PP_DecryptorStreamType decoder_type,
                          uint32_t request_id);
-  void OnMsgDecryptAndDecodeFrame(
+  void OnMsgDecryptAndDecode(
       PP_Instance instance,
-      const PPPDecryptor_Buffer& encrypted_frame,
-      const std::string& serialized_encrypted_frame_info);
+      PP_DecryptorStreamType decoder_type,
+      const PPPDecryptor_Buffer& encrypted_buffer,
+      const std::string& serialized_encrypted_block_info);
 
   const PPP_ContentDecryptor_Private* ppp_decryptor_impl_;