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

media/filters/chunk_demuxer_unittest.cc

 // 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.
 
 #include "base/bind.h"
+#include "base/message_loop.h"
 #include "media/base/audio_decoder_config.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/mock_callback.h"
 #include "media/base/mock_demuxer_host.h"
 #include "media/base/test_data_util.h"
 #include "media/filters/chunk_demuxer.h"
 #include "media/filters/chunk_demuxer_client.h"
 #include "media/webm/cluster_builder.h"
 #include "media/webm/webm_constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 648 matching lines @@
                                    timestamps[i].video_time_ms),
                                &video_read_done));
 
         EXPECT_TRUE(video_read_done);
       }
     }
 
     return true;
   }
 
+  MessageLoop message_loop_;
   MockDemuxerHost host_;
 
   scoped_ptr<MockChunkDemuxerClient> client_;
   scoped_refptr<ChunkDemuxer> demuxer_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ChunkDemuxerTest);
 };
 
 TEST_F(ChunkDemuxerTest, TestInit) {
@@ skipping 1507 matching lines @@
 
   scoped_ptr<Cluster> cluster_a(kDefaultFirstCluster());
   ASSERT_TRUE(AppendData(cluster_a->data(), cluster_a->size()));
 
   EXPECT_CALL(host_, SetDuration(
       base::TimeDelta::FromMilliseconds(kDefaultFirstClusterEndTimestamp)));
   demuxer_->EndOfStream(PIPELINE_OK);
 }
 
 }  // namespace media