Teach mojo_shell how to load http URLs

mojo/shell/task_runners.h

Index: mojo/shell/task_runners.h
diff --git a/mojo/shell/task_runners.h b/mojo/shell/task_runners.h
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+// Copyright (c) 2013 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_SHELL_TASK_RUNNERS_H_
+#define MOJO_SHELL_TASK_RUNNERS_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop_proxy.h"
+#include "base/threading/thread.h"
+
+namespace mojo {
+namespace shell {
+
+// A context object that contains the common task runners for the shell
+class TaskRunners {
+ public:
+  explicit TaskRunners(base::SingleThreadTaskRunner* ui_runner);
+  ~TaskRunners();
+
+  base::SingleThreadTaskRunner* ui_runner() const {
+    return ui_runner_.get();
+  }
+
+  base::SingleThreadTaskRunner* io_runner() const {
+    return io_thread_->message_loop_proxy();
+  }
+
+ private:
+  scoped_refptr<base::SingleThreadTaskRunner> ui_runner_;
+  scoped_ptr<base::Thread> io_thread_;
+
+  DISALLOW_COPY_AND_ASSIGN(TaskRunners);
+};
+
+}  // namespace shell
+}  // namespace mojo
+
+#endif  // MOJO_SHELL_TASK_RUNNERS_H_