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}

test/BUILD.gn

diff --git a/test/BUILD.gn b/test/BUILD.gn
index 54e2097..c62d349 100644
--- a/test/BUILD.gn
+++ b/test/BUILD.gn
@@ -64,8 +64,8 @@
     "../:typedefs",
     "../api:libjingle_peerconnection_api",
     "../api:optional",
-    "../api:video_frame_api",
-    "../api:video_frame_api_i420",
+    "../api/video:video_frame",
+    "../api/video:video_frame_i420",
     "../api/video_codecs:video_codecs_api",
     "../call:video_stream_api",
     "../common_video",
@@ -241,8 +241,8 @@
       ":video_test_common",
       "..:webrtc_common",
       "../:typedefs",
-      "../api:video_frame_api",
-      "../api:video_frame_api_i420",
+      "../api/video:video_frame",
+      "../api/video:video_frame_i420",
       "../common_video",
       "../rtc_base:checks",
       "../rtc_base:rtc_base_approved",
@@ -319,7 +319,7 @@
       ":test_support_test_artifacts",
       ":video_test_common",
       ":video_test_support",
-      "../api:video_frame_api_i420",
+      "../api/video:video_frame_i420",
       "../modules/rtp_rtcp:rtp_rtcp",
       "../rtc_base:rtc_base_approved",
       "../test:single_threaded_task_queue",
@@ -553,10 +553,10 @@
     "../:typedefs",
     "../api:libjingle_peerconnection_api",
     "../api:transport_api",
-    "../api:video_frame_api",
-    "../api:video_frame_api_i420",
     "../api/audio_codecs:builtin_audio_decoder_factory",
     "../api/audio_codecs:builtin_audio_encoder_factory",
+    "../api/video:video_frame",
+    "../api/video:video_frame_i420",
     "../api/video_codecs:video_codecs_api",
     "../audio",
     "../call",
@@ -660,7 +660,7 @@
     ":test_support",
     "..:webrtc_common",
     "../:typedefs",
-    "../api:video_frame_api",
+    "../api/video:video_frame",
     "../common_video",
     "../media:rtc_media_base",
     "../rtc_base:checks",