Cast: Added support for AES-CTR crypto.

media/cast/video_receiver/video_receiver.h

Index: media/cast/video_receiver/video_receiver.h
diff --git a/media/cast/video_receiver/video_receiver.h b/media/cast/video_receiver/video_receiver.h
index 8b14aae566a05d82a1cfc2e81ba79c00dcb1e544..69b6cc63733193e28e1adf8daf1927dd03577370 100644
--- a/media/cast/video_receiver/video_receiver.h
+++ b/media/cast/video_receiver/video_receiver.h
@@ -13,6 +13,7 @@
 #include "base/threading/non_thread_safe.h"
 #include "base/time/tick_clock.h"
 #include "base/time/time.h"
+#include "crypto/encryptor.h"
 #include "media/cast/cast_config.h"
 #include "media/cast/cast_environment.h"
 #include "media/cast/cast_receiver.h"
@@ -74,6 +75,8 @@ class VideoReceiver : public base::NonThreadSafe,
                         scoped_ptr<EncodedVideoFrame> encoded_frame,
                         const base::TimeTicks& render_time);
 
+  bool DecryptVideoFrame(scoped_ptr<EncodedVideoFrame>* video_frame);
+
   bool PullEncodedVideoFrame(uint32 rtp_timestamp,
                              bool next_frame,
                              scoped_ptr<EncodedVideoFrame>* encoded_frame,
@@ -109,11 +112,10 @@ class VideoReceiver : public base::NonThreadSafe,
   scoped_ptr<Rtcp> rtcp_;
   scoped_ptr<RtpReceiverStatistics> rtp_video_receiver_statistics_;
   base::TimeTicks time_last_sent_cast_message_;
-  // Sender-receiver offset estimation.
-  base::TimeDelta time_offset_;
-
+  base::TimeDelta time_offset_;  // Sender-receiver offset estimation.
+  scoped_ptr<crypto::Encryptor> decryptor_;
+  std::string iv_mask_;
   std::list<VideoFrameEncodedCallback> queued_encoded_callbacks_;
-
   base::WeakPtrFactory<VideoReceiver> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoReceiver);