Replace WaitableEvents and ConditionalVariables in VideoRendererBase tests with MessageLoop.

media/base/test_helpers.h

Index: media/base/test_helpers.h
diff --git a/media/base/test_helpers.h b/media/base/test_helpers.h
new file mode 100644
index 0000000000000000000000000000000000000000..1c386948733499d09bdde7d71b1c1a83aea5ad21
--- /dev/null
+++ b/media/base/test_helpers.h
@@ -0,0 +1,57 @@
+// Copyright (c) 2012 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 MEDIA_BASE_TEST_HELPERS_H_
+#define MEDIA_BASE_TEST_HELPERS_H_
+
+#include "base/callback.h"
+#include "media/base/pipeline_status.h"
+#include "testing/gmock/include/gmock/gmock.h"
+
+class MessageLoop;
+
+namespace media {
+
+// Return a callback that expects to be run once.
+base::Closure NewExpectedClosure();
+PipelineStatusCB NewExpectedStatusCB(PipelineStatus status);
+
+// Helper class for running a message loop until a callback has run. Useful for
+// testing classes that run on more than a single thread.
+//
+// Events are intended for single use and cannot be reset.
+class WaitableMessageLoopEvent {
+ public:
+  WaitableMessageLoopEvent();
+  ~WaitableMessageLoopEvent();
+
+  // Returns a thread-safe closure that will signal |this| when executed.
+  base::Closure GetClosure();
+  PipelineStatusCB GetPipelineStatusCB();
+
+  // Runs the current message loop until |this| has been signaled.
+  //
+  // Fails the test if the timeout is reached.
+  void RunAndWait();
+
+  // Runs the current message loop until |this| has been signaled and asserts
+  // that the |expected| status was received.
+  //
+  // Fails the test if the timeout is reached.
+  void RunAndWaitForStatus(PipelineStatus expected);
+
+ private:
+  void OnCallback(PipelineStatus status);
+  void OnTimeout();
+
+  MessageLoop* message_loop_;
+  bool signaled_;
+  PipelineStatus status_;
+
+  DISALLOW_COPY_AND_ASSIGN(WaitableMessageLoopEvent);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_TEST_HELPERS_H_