mojo: Allow basic RunLoop to be quit from a posted task.

mojo/public/cpp/utility/tests/run_loop_unittest.cc

 // 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.
 
 #include "mojo/public/cpp/utility/run_loop.h"
 
 #include <string>
 
 #include "mojo/public/cpp/system/core.h"
 #include "mojo/public/cpp/test_support/test_utils.h"
@@ skipping 395 matching lines @@
   run_loop.PostDelayedTask(Closure(Task(2, &sequence)), 0);
   run_loop.PostDelayedTask(Closure(Task(3, &sequence)), 0);
   run_loop.RunUntilIdle();
 
   ASSERT_EQ(3u, sequence.size());
   EXPECT_EQ(1, sequence[0]);
   EXPECT_EQ(2, sequence[1]);
   EXPECT_EQ(3, sequence[2]);
 }
 
+struct QuittingTask {
+  QuittingTask(RunLoop* run_loop) : run_loop(run_loop) {}
+
+  void Run() const { run_loop->Quit(); }
+
+  RunLoop* run_loop;
+};
+
+TEST_F(RunLoopTest, QuitFromDelayedTask) {
+  TestRunLoopHandler handler;
+  MessagePipe test_pipe;
+  RunLoop run_loop;
+  run_loop.AddHandler(&handler,
+                      test_pipe.handle0.get(),
+                      MOJO_HANDLE_SIGNAL_READABLE,
+                      MOJO_DEADLINE_INDEFINITE);
+  run_loop.PostDelayedTask(Closure(QuittingTask(&run_loop)), 0);
+  run_loop.Run();
+}
+
 }  // namespace
 }  // namespace mojo