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

mojo/public/cpp/utility/run_loop.h

Index: mojo/public/cpp/utility/run_loop.h
diff --git a/mojo/public/cpp/utility/run_loop.h b/mojo/public/cpp/utility/run_loop.h
index cba28629bd03b0711e4a33cdf8136c4714de92dc..0ecc8297603b5237510f5bfbf614d5de7b177435 100644
--- a/mojo/public/cpp/utility/run_loop.h
+++ b/mojo/public/cpp/utility/run_loop.h
@@ -40,12 +40,12 @@ class RunLoop {
   void RemoveHandler(const Handle& handle);
   bool HasHandler(const Handle& handle) const;
 
-  // Runs the loop servicing handles as they are ready. This returns when Quit()
-  // is invoked, or there no more handles.
+  // Runs the loop servicing handles and tasks as they are ready. This returns
+  // when Quit() is invoked, or there are no more handles nor tasks.
   void Run();
 
-  // Runs the loop servicing any handles that are ready. Does not wait for
-  // handles to become ready before returning. Returns early if Quit() is
+  // Runs the loop servicing any handles and tasks that are ready. Does not wait
+  // for handles to become ready before returning. Returns early if Quit() is
   // invoked.
   void RunUntilIdle();
 
@@ -83,13 +83,19 @@ class RunLoop {
     IGNORE_DEADLINE
   };
 
+  // Runs the loop servicing any handles that are ready. If |until_idle| is
+  // true, does not wait for handles to become ready before returning. Returns
+  // early if Quit() is invoked.
+  void RunInternal(bool until_idle);
+
   // Do one unit of delayed work, if eligible.
   void DoDelayedWork();
 
-  // Waits for a handle to be ready. Returns after servicing at least one
-  // handle (or there are no more handles) unless |non_blocking| is true,
-  // in which case it will also return if servicing at least one handle
-  // would require blocking. Returns true if a RunLoopHandler was notified.
+  // Waits for a handle to be ready or until the next task must be run. Returns
+  // after servicing at least one handle (or there are no more handles) unless
+  // a task must be run or |non_blocking| is true, in which case it will also
+  // return if no task is registered and servicing at least one handle would
+  // require blocking. Returns true if a RunLoopHandler was notified.
   bool Wait(bool non_blocking);
 
   // Notifies handlers of |error|.  If |check| == CHECK_DEADLINE, this will