Move VideoFrame and related declarations to webrtc/api/video.

webrtc/api/BUILD.gn

Index: webrtc/api/BUILD.gn
diff --git a/webrtc/api/BUILD.gn b/webrtc/api/BUILD.gn
index dabfb4b2f90113b6cdcc1ea6de8b9a88ef33c716..0ba0638c1e8b6f0f64909e82c30220c8ef527bf0 100644
--- a/webrtc/api/BUILD.gn
+++ b/webrtc/api/BUILD.gn
@@ -368,6 +368,34 @@ rtc_source_set("transport_api") {
     "call/transport.h",
   ]
 }
+
+rtc_source_set("video_frame_api") {
+  sources = [
+    "video/i420_buffer.cc",
+    "video/i420_buffer.h",
+    "video/video_frame.cc",
+    "video/video_frame.h",
+    "video/video_frame_buffer.h",
+    "video/video_rotation.h",
+  ]
+
+  deps = [
+    "../base:rtc_base_approved",
+  ]
+
+  # TODO(nisse): This logic is duplicated in multiple places.
+  # Define in a single place.
+  if (rtc_build_libyuv) {
+    deps += [ "$rtc_libyuv_dir" ]
+    public_deps = [
+      "$rtc_libyuv_dir",
+    ]
+  } else {
+    # Need to add a directory normally exported by libyuv.
+    include_dirs = [ "$rtc_libyuv_dir/include" ]
+  }
+}
+
 if (rtc_include_tests) {
   config("peerconnection_unittests_config") {
     # The warnings below are enabled by default. Since GN orders compiler flags