RTCStats and RTCStatsReport added (webrtc/stats)

webrtc/BUILD.gn

Index: webrtc/BUILD.gn
diff --git a/webrtc/BUILD.gn b/webrtc/BUILD.gn
index 94ce0120b61e73b84d076c385625bc51fcc17862..d91de61b5ca9d4c1c53c944a0c6a03bd3d4565cf 100644
--- a/webrtc/BUILD.gn
+++ b/webrtc/BUILD.gn
@@ -259,6 +259,7 @@ if (!is_ios || !build_with_chromium) {
       "common_audio",
       "common_video",
       "modules",
+      "stats:rtc_stats",

[hbos, 2016/08/13 08:31:39]

Should I list the unittest (rtc_stats_unittests) too, here or somewhere else? In
all.gyp wildcards are listed (e.g. stats.gyp:*) but that is not he trend here.
In any case, rtc_stats_unittests is globally known without explicitly being
listed.

[kjellander_webrtc, 2016/08/15 11:21:51]

If you just put "stats" here, GN will make the assumption that you have a
'stats' target inside the webrtc/stats/BUILD.gn (I even think it'll complain if
one is missing). 
I suggest you follow the pattern with a group entry as in
https://chromium.googlesource.com/external/webrtc/+/master/webrtc/media/BUILD.gn.

Since we don't want to include our test targets in Chromium builds, make sure to
just have it inside a rtc_include_tests condition, then it'll be processed (as
you've already noticed)

[hbos, 2016/08/15 13:27:11]

Done.

       "system_wrappers",
       "tools",
       "video",