Add a user id parameter to connections

mojo/shell/public/interfaces/shell_client.mojom

Index: mojo/shell/public/interfaces/shell_client.mojom
diff --git a/mojo/shell/public/interfaces/shell_client.mojom b/mojo/shell/public/interfaces/shell_client.mojom
index af0fcb6c8250463dadf8bb14ac16c3256862da3e..dfc34b0c3a43d80b4cfcb3d2ced39f7369949c23 100644
--- a/mojo/shell/public/interfaces/shell_client.mojom
+++ b/mojo/shell/public/interfaces/shell_client.mojom
@@ -28,7 +28,7 @@ interface ShellClient {
   // The |id| parameter is the identifier of the instance in the
   // ApplicationManager. It can be passed to other shell interfaces that request
   // an instance identifier.
-  Initialize(Shell shell, string url, uint32 id);
+  Initialize(Shell shell, string url, uint32 id, uint32 user_id);

[sky, 2016/02/23 21:15:13]

Please add more comments as to what the ids mean.

 
   // Called when another application (identified by |requestor_url|) attempts to
   // open a connection to this application.
@@ -64,6 +64,7 @@ interface ShellClient {
   //
   AcceptConnection(string requestor_url,
                    uint32 requestor_id,
+                   uint32 requestor_user_id,
                    InterfaceProvider&? local_interfaces,
                    InterfaceProvider? remote_interfaces,
                    array<string> allowed_interfaces,