Allow mojo_runner to connect to arbitrary executables.

mojo/runner/child/runner_connection.h

Index: mojo/runner/child/runner_connection.h
diff --git a/mojo/runner/child/runner_connection.h b/mojo/runner/child/runner_connection.h
new file mode 100644
index 0000000000000000000000000000000000000000..8ca8778af989d35b92dc2ef57489987028adb733
--- /dev/null
+++ b/mojo/runner/child/runner_connection.h
@@ -0,0 +1,39 @@
+// 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 MOJO_RUNNER_CHILD_RUNNER_CONNECTION_H_
+#define MOJO_RUNNER_CHILD_RUNNER_CONNECTION_H_
+
+#include "base/macros.h"
+#include "mojo/application/public/interfaces/application.mojom.h"
+
+namespace mojo {
+namespace runner {
+
+// Encapsulates a connection to a runner process. The connection object starts a
+// background controller thread that is used to receive control messages from
+// the runner. When this object is destroyed the thread is joined.
+class RunnerConnection {
+ public:
+  virtual ~RunnerConnection();
+
+  // Establish a connection to the runner, blocking the calling thread until
+  // it is established. The Application request from the runner is returned via
+  // |request|.
+  // If a connection to the runner cannot be established, |request| will not be
+  // modified and this function will return null.
+  static RunnerConnection* ConnectToRunner(
+      InterfaceRequest<Application>* request);
+
+ protected:
+  RunnerConnection();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(RunnerConnection);
+};
+
+}  // namespace runner
+}  // namespace mojo
+
+#endif  // MOJO_RUNNER_CHILD_RUNNER_CONNECTION_H_