Add "type" in GenerateKeyRequest() and OnNeedKey().

media/base/decryptor_client.h

Index: media/base/decryptor_client.h
diff --git a/media/base/decryptor_client.h b/media/base/decryptor_client.h
index 9db50cec662b06dd3675f5ac300cc17bb9896c45..dc644193febd8ceeb9e2d583af92c2601ecbd402 100644
--- a/media/base/decryptor_client.h
+++ b/media/base/decryptor_client.h
@@ -36,8 +36,11 @@ class DecryptorClient {
 
   // Signals that a key is needed for decryption. |key_system| and |session_id|
   // can be empty if the key system has not been selected.
+  // TODO(xhwang): Figure out if "type" is optional for NeedKey fired from the
+  // decoder.
   virtual void NeedKey(const std::string& key_system,
                        const std::string& session_id,
+                       const std::string& type,
                        scoped_array<uint8> init_data,
                        int init_data_length) = 0;