Introduce api/crypto/BUILD.gn.

No-Try: True
Bug: webrtc:8733
Change-Id: I8679735be1e5069e371a9f1115a54e897e09964b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/152622
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29186}
diff --git a/video/BUILD.gn b/video/BUILD.gn
index af34436..09ea987 100644
--- a/video/BUILD.gn
+++ b/video/BUILD.gn
@@ -58,6 +58,8 @@
     "../api:rtp_parameters",
     "../api:scoped_refptr",
     "../api:transport_api",
+    "../api/crypto:frame_decryptor_interface",
+    "../api/crypto:options",
     "../api/rtc_event_log",
     "../api/task_queue",
     "../api/transport/media:media_transport_interface",
@@ -574,6 +576,7 @@
       "../api:rtp_parameters",
       "../api:scoped_refptr",
       "../api:simulated_network_api",
+      "../api/crypto:options",
       "../api/rtc_event_log",
       "../api/task_queue:default_task_queue_factory",
       "../api/test/video:function_video_factory",