media: Reland "Simplify {Audio|Video}Decoder initialization callback."

media/base/test_helpers.h

 // 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/basictypes.h"
 #include "base/callback.h"
 #include "media/base/channel_layout.h"
@@ skipping 10 matching lines @@
 class TimeDelta;
 }
 
 namespace media {
 
 class AudioBuffer;
 class DecoderBuffer;
 
 // Return a callback that expects to be run once.
 base::Closure NewExpectedClosure();
+base::Callback<void(bool)> NewExpectedBoolCB(bool success);
 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();
@@ skipping 103 matching lines @@
 };
 
 // Test implementation of a media log LogCB that sends media log messages to
 // DVLOG(1).
 void AddLogEntryForTest(MediaLog::MediaLogLevel level,
                         const std::string& message);
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_TEST_HELPERS_H_