New file api/video/BUILD.gn

Build targets involving files under api/video/ are moved into this
file, from api/BUILD.gn. In addition, drop "_api" part of target
names, and move the header file api/videosinkinterface.h to
api/video/video_sink_interface.h.

Bug: webrtc:9253
Change-Id: I2896d3f063db8dff902bc29738578395b2fcc155
Reviewed-on: https://webrtc-review.googlesource.com/75500
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23207}

call/BUILD.gn

@@ -222,7 +222,7 @@ rtc_source_set("video_stream_api") {
     "../api:libjingle_peerconnection_api",
     "../api:optional",
     "../api:transport_api",
-    "../api:video_frame_api",
+    "../api/video:video_frame",
     "../api/video_codecs:video_codecs_api",
     "../common_video:common_video",
     "../modules/rtp_rtcp:rtp_rtcp_format",

call/video_receive_stream.h

@@ -21,7 +21,7 @@
 #include "api/rtpparameters.h"
 #include "api/video/video_content_type.h"
 #include "api/video/video_timing.h"
-#include "api/videosinkinterface.h"
+#include "api/video/video_sink_interface.h"
 #include "call/rtp_config.h"
 #include "common_types.h"  // NOLINT(build/include)
 #include "common_video/include/frame_callback.h"

call/video_send_stream.h

@@ -19,7 +19,7 @@
 #include "api/call/transport.h"
 #include "api/rtpparameters.h"
 #include "api/rtp_headers.h"
-#include "api/videosinkinterface.h"
+#include "api/video/video_sink_interface.h"
 #include "api/videosourceinterface.h"
 #include "api/video_codecs/video_encoder_factory.h"
 #include "call/rtp_config.h"