[OLD ATTEMPT, DO NOT REVIEW] mustash: Enable connections to mus from the Chrome renderer

content/browser/mojo/mojo_shell_client_host.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_MOJO_MOJO_SHELL_CLIENT_HOST_H_
 #define CONTENT_BROWSER_MOJO_MOJO_SHELL_CLIENT_HOST_H_
 
 #include <string>
 
 #include "base/process/process_handle.h"
 
+namespace mojo {
+class ApplicationConnection;
+}
+
 namespace content {
 
 class RenderProcessHost;
 
 // Creates a communication channel between the external Mojo shell and the
 // child. The server handle of this channel is shared with the external shell
 // via Mojo IPC and the client handle is shared with the child via Chrome IPC.
 // |child_process_id| is used to uniquify the child in the external shell's
 // instance map.
 void RegisterChildWithExternalShell(int child_process_id,
                                     base::ProcessHandle process_handle,
                                     RenderProcessHost* render_process_host);
 
 // Returns the URL associated with an instance corresponding to the renderer
 // process in the external shell. This URL can be passed to
 // ConnectToApplication() to open a new connection to this renderer.
 std::string GetMojoApplicationInstanceURL(
     RenderProcessHost* render_process_host);
 
+// Returns the RenderProcessHost ID associated with the mojo app URL.
+int GetRenderProcessIDFromConnection(mojo::ApplicationConnection* connection);
+
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MOJO_MOJO_SHELL_CLIENT_HOST_H_