Move Shell connection to content

content/public/common/mojo_shell_connection.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_PUBLIC_COMMON_MOJO_SHELL_CONNECTION_H_
+#define CONTENT_PUBLIC_COMMON_MOJO_SHELL_CONNECTION_H_
+
+#include "content/common/content_export.h"
+
+namespace mojo {
+class ApplicationConnection;
+class ApplicationImpl;
+}
+
+namespace content {
+
+// Encapsulates a connection to a spawning external Mojo shell.
+// Access an instance by calling Get(), on the thread the Shell connection is
+// bound. Clients can implement Listener, which allows them to register services
+// to expose to inbound connections. Clients should call this any time after
+// the main message loop is created but not yet run (e.g. in the browser process
+// this object is created in PreMainMessageLoopRun(), so the BrowserMainParts
+// impl can access this in its implementation of that same method.
+class CONTENT_EXPORT MojoShellConnection {
+ public:
+  // Override to add additional services to inbound connections.
+  class Listener {
+   public:
+    virtual bool ConfigureIncomingConnection(
+        mojo::ApplicationConnection* connection) = 0;
+
+   protected:
+    virtual ~Listener() {}
+  };
+
+  // Will return null if no connection has been established (either because it
+  // hasn't happened yet or the application was not spawned from the external
+  // Mojo shell.
+  static MojoShellConnection* Get();
+
+  // Destroys the connection. Must be called on the thread the connection was
+  // created on.
+  static void Destroy();
+
+  // Returns an Initialized() ApplicationImpl.
+  virtual mojo::ApplicationImpl* GetApplication() = 0;
+
+  // [De]Register an impl of Listener that will be consulted when the wrapped
+  // ApplicationImpl exposes services to inbound connections.
+  virtual void AddListener(Listener* listener) = 0;
+  virtual void RemoveListener(Listener* listener) = 0;
+
+ protected:
+  virtual ~MojoShellConnection();
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_COMMON_MOJO_SHELL_CONNECTION_H_