Initialize the CDM asynchronously

content/renderer/media/crypto/proxy_media_keys.h

Index: content/renderer/media/crypto/proxy_media_keys.h
diff --git a/content/renderer/media/crypto/proxy_media_keys.h b/content/renderer/media/crypto/proxy_media_keys.h
index 979de0a94ea4200944b6b34b6d7a847570bdf584..e7fadf5ea37abf1c469df5599398426abb089c23 100644
--- a/content/renderer/media/crypto/proxy_media_keys.h
+++ b/content/renderer/media/crypto/proxy_media_keys.h
@@ -34,7 +34,8 @@ class ProxyMediaKeys : public media::MediaKeys, public media::CdmContext {
       const media::SessionClosedCB& session_closed_cb,
       const media::LegacySessionErrorCB& legacy_session_error_cb,
       const media::SessionKeysChangeCB& session_keys_change_cb,
-      const media::SessionExpirationUpdateCB& session_expiration_update_cb);
+      const media::SessionExpirationUpdateCB& session_expiration_update_cb,
+      const media::CdmCreatedCB& cdm_created_cb);
 
   ~ProxyMediaKeys() override;
 
@@ -97,7 +98,8 @@ class ProxyMediaKeys : public media::MediaKeys, public media::CdmContext {
       const media::SessionExpirationUpdateCB& session_expiration_update_cb);
 
   void InitializeCdm(const std::string& key_system,
-                     const GURL& security_origin);
+                     const GURL& security_origin,
+                     scoped_ptr<media::SimpleCdmPromise> promise);
 
   RendererCdmManager* manager_;
   int cdm_id_;