Cast: Added support for AES-CTR crypto.

media/cast/video_sender/video_sender.h

Index: media/cast/video_sender/video_sender.h
diff --git a/media/cast/video_sender/video_sender.h b/media/cast/video_sender/video_sender.h
index 7bd60293b099e40271afcfaa52eae48c1a6873bd..9e443afb4a75aa9f4274a8977fea987c27a6a2c6 100644
--- a/media/cast/video_sender/video_sender.h
+++ b/media/cast/video_sender/video_sender.h
@@ -12,6 +12,7 @@
 #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/congestion_control/congestion_control.h"
@@ -101,6 +102,11 @@ class VideoSender : public base::NonThreadSafe,
       scoped_ptr<EncodedVideoFrame> video_frame,
       const base::TimeTicks& capture_time);
 
+  // Caller must allocate the destination |encrypted_video_frame| the data
+  // member will be resized to hold the encrypted size.
+  bool EncryptVideoFrame(const EncodedVideoFrame* encoded_frame,
+                         EncodedVideoFrame* encrypted_video_frame);
+
   const uint32 incoming_feedback_ssrc_;
   const base::TimeDelta rtp_max_delay_;
   const int max_frame_rate_;
@@ -113,6 +119,8 @@ class VideoSender : public base::NonThreadSafe,
   scoped_ptr<RtpSender> rtp_sender_;
   VideoEncoderController* video_encoder_controller_;
   uint8 max_unacked_frames_;
+  scoped_ptr<crypto::Encryptor> encryptor_;
+  std::string iv_mask_;
   int last_acked_frame_id_;
   int last_sent_frame_id_;
   int last_sent_key_frame_id_;