Initialize the CDM asynchronously

ppapi/proxy/ppp_content_decryptor_private_proxy.cc

Index: ppapi/proxy/ppp_content_decryptor_private_proxy.cc
diff --git a/ppapi/proxy/ppp_content_decryptor_private_proxy.cc b/ppapi/proxy/ppp_content_decryptor_private_proxy.cc
index e64463805ef2d94c9338a0b445ffcfb66f0cd240..3f6315f0794e9abf6f45ea0e8d2346bb1ce3304c 100644
--- a/ppapi/proxy/ppp_content_decryptor_private_proxy.cc
+++ b/ppapi/proxy/ppp_content_decryptor_private_proxy.cc
@@ -112,6 +112,7 @@ bool InitializePppDecryptorBuffer(PP_Instance instance,
 }
 
 void Initialize(PP_Instance instance,
+                uint32_t promise_id,
                 PP_Var key_system,
                 PP_Bool allow_distinctive_identifier,
                 PP_Bool allow_persistent_state) {
@@ -121,13 +122,10 @@ void Initialize(PP_Instance instance,
     return;
   }
 
-  dispatcher->Send(
-      new PpapiMsg_PPPContentDecryptor_Initialize(
-          API_ID_PPP_CONTENT_DECRYPTOR_PRIVATE,
-          instance,
-          SerializedVarSendInput(dispatcher, key_system),
-          allow_distinctive_identifier,
-          allow_persistent_state));
+  dispatcher->Send(new PpapiMsg_PPPContentDecryptor_Initialize(
+      API_ID_PPP_CONTENT_DECRYPTOR_PRIVATE, instance, promise_id,
+      SerializedVarSendInput(dispatcher, key_system),
+      allow_distinctive_identifier, allow_persistent_state));
 }
 
 void SetServerCertificate(PP_Instance instance,
@@ -524,16 +522,14 @@ bool PPP_ContentDecryptor_Private_Proxy::OnMessageReceived(
 
 void PPP_ContentDecryptor_Private_Proxy::OnMsgInitialize(
     PP_Instance instance,
+    uint32_t promise_id,
     SerializedVarReceiveInput key_system,
     PP_Bool allow_distinctive_identifier,
     PP_Bool allow_persistent_state) {
   if (ppp_decryptor_impl_) {
-    CallWhileUnlocked(
-        ppp_decryptor_impl_->Initialize,
-        instance,
-        ExtractReceivedVarAndAddRef(dispatcher(), &key_system),
-        allow_distinctive_identifier,
-        allow_persistent_state);
+    CallWhileUnlocked(ppp_decryptor_impl_->Initialize, instance, promise_id,
+                      ExtractReceivedVarAndAddRef(dispatcher(), &key_system),
+                      allow_distinctive_identifier, allow_persistent_state);
   }
 }