Implement "Key Presence" step in "Encrypted Block Encounted" algorithm in EME.

media/base/mock_filters.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.
 //
 // A new breed of mock media filters, this time using gmock!  Feel free to add
 // actions if you need interesting side-effects.
 //
 // Don't forget you can use StrictMock<> and NiceMock<> if you want the mock
 // filters to fail the test or do nothing when an unexpected method is called.
 // http://code.google.com/p/googlemock/wiki/CookBook#Nice_Mocks_and_Strict_Mocks
@@ skipping 194 matching lines @@
   MOCK_METHOD6(AddKey, void(const std::string& key_system,
                             const uint8* key,
                             int key_length,
                             const uint8* init_data,
                             int init_data_length,
                             const std::string& session_id));
   MOCK_METHOD2(CancelKeyRequest, void(const std::string& key_system,
                                       const std::string& session_id));
   MOCK_METHOD2(Decrypt, void(const scoped_refptr<DecoderBuffer>& encrypted,
                              const DecryptCB& decrypt_cb));
+  MOCK_METHOD0(Stop, void());
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockDecryptor);
 };
 
 class MockDecryptorClient : public DecryptorClient {
  public:
   MockDecryptorClient();
   virtual ~MockDecryptorClient();
 
@@ skipping 74 matching lines @@
  public:
   MockStatisticsCB();
   ~MockStatisticsCB();
 
   MOCK_METHOD1(OnStatistics, void(const media::PipelineStatistics& statistics));
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_MOCK_FILTERS_H_