Upstream RunBlockingPoolTask().

content/public/test/test_utils.h

Index: content/public/test/test_utils.h
diff --git a/content/public/test/test_utils.h b/content/public/test/test_utils.h
index bf3e1f8d62f7b14fcc60ef3100bff6ff3592b249..ce49040188bbcdf3f1c37e13546ad5b86ff455bf 100644
--- a/content/public/test/test_utils.h
+++ b/content/public/test/test_utils.h
@@ -18,7 +18,7 @@
 
 namespace base {
 class Value;
-}
+}  // namespace base
 
 // A collection of functions designed for use with unit and browser tests.
 
@@ -44,6 +44,10 @@ void RunAllPendingInMessageLoop();
 // thread |thread_id| have been processed.
 void RunAllPendingInMessageLoop(BrowserThread::ID thread_id);
 
+// Runs until both the blocking pool and the current message loop are empty
+// (have no more scheduled tasks) and no tasks are running.
+void RunAllBlockingPoolTasksUntilIdle();
+
 // Get task to quit the given RunLoop. It allows a few generations of pending
 // tasks to run as opposed to run_loop->QuitClosure().
 base::Closure GetQuitTaskForRunLoop(base::RunLoop* run_loop);