Add Common Encryption support to BMFF, including subsample decryption.

media/webm/webm_cluster_parser.cc

Index: media/webm/webm_cluster_parser.cc
diff --git a/media/webm/webm_cluster_parser.cc b/media/webm/webm_cluster_parser.cc
index 20d131e9b7ee7ed0c369de744c257e1cb62b7edd..cb43724a848d7db1abbe07090ea43f8d7fb2d921 100644
--- a/media/webm/webm_cluster_parser.cc
+++ b/media/webm/webm_cluster_parser.cc
@@ -235,10 +235,14 @@ bool WebMClusterParser::OnBlock(int track_num, int timecode,
 
     scoped_array<uint8> counter_block(GenerateCounterBlock(iv));
     buffer->SetDecryptConfig(scoped_ptr<DecryptConfig>(new DecryptConfig(
-        video_encryption_key_id_.get(), video_encryption_key_id_size_,
-        counter_block.get(), DecryptConfig::kDecryptionKeySize,
-        data, kWebMHmacSize,
-        sizeof(iv))));
+        std::string(video_encryption_key_id_.get(),
+                    video_encryption_key_id_.get() +
+                    video_encryption_key_id_size_),
+        std::string(counter_block.get(),
+                    counter_block.get() + DecryptConfig::kDecryptionKeySize),
+        std::string(data, data + kWebMHmacSize),
+        sizeof(iv),
+        std::vector<SubsampleEntry>())));
   }
 
   buffer->SetTimestamp(timestamp);