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

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
index 8dc38958f5d2a0605b435d9f599e20bb17fd8ab5..ffd738bb10d7a24adaecc0019cf06de216a5ce9a 100644
--- a/media/base/test_helpers.h
+++ b/media/base/test_helpers.h
@@ -125,6 +125,20 @@ scoped_refptr<DecoderBuffer> CreateFakeVideoBufferForTest(
 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();
+  void B();
+
+ private:
+  bool a_called_;

[ddorwin, 2014/08/07 19:52:04]

...without_b_
Or maybe, expecting_b_

[jrummell, 2014/08/08 20:58:28]

Like expecting_B_. Done.

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