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

media/base/decryptor.h

Index: media/base/decryptor.h
diff --git a/media/base/decryptor.h b/media/base/decryptor.h
index 37f5e7ab3a9f7ec48fe6f4b773474859c5b5a751..de293e9f791493081ad3c54cfbcd8f313be154cb 100644
--- a/media/base/decryptor.h
+++ b/media/base/decryptor.h
@@ -64,11 +64,13 @@ class MEDIA_EXPORT Decryptor {
   Decryptor();
   virtual ~Decryptor();
 
-  // Generates a key request for the |key_system| with |init_data| provided.
+  // Generates a key request for the |key_system| with |type| and
+  // |init_data| provided.
   // Returns true if generating key request succeeded, false otherwise.
   // Note: AddKey() and CancelKeyRequest() should only be called after
   // GenerateKeyRequest() returns true.
   virtual bool GenerateKeyRequest(const std::string& key_system,
+                                  const std::string& type,
                                   const uint8* init_data,
                                   int init_data_length) = 0;