Filter webrtc::RTCStats by whitelist in surfacing them to Blink.

content/test/BUILD.gn

Index: content/test/BUILD.gn
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index 38a97860c1546658d77463c3b768a6c96ba6141c..5e633dee4baa136e20230b237052f054df450622 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -1524,6 +1524,7 @@ test("content_unittests") {
       "../renderer/media/webrtc/media_stream_video_webrtc_sink_unittest.cc",
       "../renderer/media/webrtc/peer_connection_dependency_factory_unittest.cc",
       "../renderer/media/webrtc/processed_local_audio_source_unittest.cc",
+      "../renderer/media/webrtc/rtc_stats_unittest.cc",
       "../renderer/media/webrtc/stun_field_trial_unittest.cc",
       "../renderer/media/webrtc/webrtc_media_stream_adapter_unittest.cc",
       "../renderer/media/webrtc/webrtc_video_capturer_adapter_unittest.cc",
@@ -1538,6 +1539,7 @@ test("content_unittests") {
       "//third_party/libjingle/webrtc:libjingle_webrtc",
       "//third_party/opus",
       "//third_party/webrtc/api:libjingle_peerconnection",
+      "//third_party/webrtc/api:rtc_stats_api",
       "//third_party/webrtc/base:rtc_base",
       "//third_party/webrtc/media:rtc_media",
       "//third_party/webrtc/modules/desktop_capture:primitives",