Allow setContentDecryptionModule() to get called when setting is done.

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 107 matching lines @@
 // some sanity check.
 scoped_refptr<DecoderBuffer> CreateFakeVideoBufferForTest(
     const VideoDecoderConfig& config,
     base::TimeDelta timestamp,
     base::TimeDelta duration);
 
 // Verify if a fake video DecoderBuffer is valid.
 bool VerifyFakeVideoBufferForTest(const scoped_refptr<DecoderBuffer>& buffer,
                                   const VideoDecoderConfig& config);
 
+// Used to verify that the number of calls to A() match the number of calls to
+// B() and that the calls happen in pairs (e.g. B() called after every A()
+// call). There may be any number of pairs (including 0).
+class MatchingCallbackVerifier {
+ public:
+  MatchingCallbackVerifier();
+  ~MatchingCallbackVerifier();
+  void A();

[ddorwin, 2014/08/08 21:15:26]

nit: I wonder if this should be "RecordACalled" or "RecordA"

[jrummell, 2014/08/08 23:39:59]

Done.

+  void B();
+
+ private:
+  bool expecting_B_;

[ddorwin, 2014/08/08 21:15:26]

nit: 'b'

[jrummell, 2014/08/08 23:39:59]

Done.

+};
+
 }  // namespace media
 
 #endif  // MEDIA_BASE_TEST_HELPERS_H_