Implement MediaSource support for mojo.

media/blink/null_encrypted_media_player_support.cc

Index: media/blink/null_encrypted_media_player_support.cc
diff --git a/media/blink/null_encrypted_media_player_support.cc b/media/blink/null_encrypted_media_player_support.cc
index a67893bc7e5ac91fb790cb53c52c493f1c58cc5d..240e23e5b5c527388c786666c0e4d8d01facd25a 100644
--- a/media/blink/null_encrypted_media_player_support.cc
+++ b/media/blink/null_encrypted_media_player_support.cc
@@ -4,11 +4,17 @@
 
 #include "media/blink/null_encrypted_media_player_support.h"
 
+#include "base/bind.h"
 #include "third_party/WebKit/public/platform/WebContentDecryptionModule.h"
 #include "third_party/WebKit/public/platform/WebContentDecryptionModuleResult.h"
 
 namespace media {
 
+static void NeedKeyHandler(const std::string& type,

[jamesr, 2014/10/16 18:24:01]

i think instead of static putting this in a anonymous namespace would be better
so you don't collide with anything that someone else wants to put in namespace
media with this name

[DaleCurtis, 2014/10/16 18:29:50]

media code typically prefers the static prefix to anonymous namespace, but since
this is EME code I defer to whatever xhwang@ wants.

+                           const std::vector<uint8>& init_data) {
+  NOTIMPLEMENTED();
+}
+
 scoped_ptr<EncryptedMediaPlayerSupport>
 NullEncryptedMediaPlayerSupport::Create(blink::WebMediaPlayerClient* client) {
   return scoped_ptr<EncryptedMediaPlayerSupport>(
@@ -66,7 +72,7 @@ void NullEncryptedMediaPlayerSupport::SetContentDecryptionModule(
 }
 
 Demuxer::NeedKeyCB NullEncryptedMediaPlayerSupport::CreateNeedKeyCB() {
-  return Demuxer::NeedKeyCB();
+  return base::Bind(&NeedKeyHandler);
 }
 
 SetDecryptorReadyCB