mojo: Add a runloop utility in python

mojo/public/python/mojo/c_environment.pxd

Index: mojo/public/python/mojo/c_environment.pxd
diff --git a/mojo/public/python/mojo/c_environment.pxd b/mojo/public/python/mojo/c_environment.pxd
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+++ b/mojo/public/python/mojo/c_environment.pxd
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+# Copyright 2014 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.
+
+# distutils: language = c++
+
+from libc.stdint cimport int64_t
+
+
+cdef extern from "mojo/public/cpp/bindings/callback.h" nogil:
+  cdef cppclass CClosure "mojo::Callback<void()>":
+    CClosure()
+    CClosure(CRunnable)
+
+
+cdef extern from "mojo/public/python/src/python_system_helper.h" \
+    namespace "mojo" nogil:
+  cdef CClosure BuildClosure(object)
+  cdef void InitRunLoop()
+
+
+cdef extern from "mojo/public/cpp/utility/run_loop.h" nogil:
+  cdef cppclass CRunLoop "mojo::RunLoop":
+    CRunLoop()
+    void Run()
+    void RunUntilIdle()
+    void Quit()
+    void PostDelayedTask(CClosure& task, int64_t delay)