Create //webrtc/api:libjingle_peerconnection_api + refactorings.

webrtc/api/BUILD.gn

Index: webrtc/api/BUILD.gn
diff --git a/webrtc/api/BUILD.gn b/webrtc/api/BUILD.gn
index 01aacb745928c2f1ed09e47a6e4dd577084b31ff..7fd8f0a678cb97294517f8db2e29ca17beec2b9b 100644
--- a/webrtc/api/BUILD.gn
+++ b/webrtc/api/BUILD.gn
@@ -52,6 +52,30 @@ config("libjingle_peerconnection_warnings_config") {
   }
 }
 
+rtc_static_library("libjingle_peerconnection_api") {
+  cflags = []
+  sources = [
+    "datachannelinterface.h",
+    "dtmfsenderinterface.h",
+    "jsep.h",
+    "mediastreaminterface.h",
+    "mediatype.cc",
+    "mediatype.h",
+    "peerconnectioninterface.h",
+    "proxy.h",
+    "rtpparameters.h",
+    "rtpreceiverinterface.h",
+    "rtpsenderinterface.h",
+    "statstypes.cc",
+    "statstypes.h",
+    "umametrics.h",
+  ]
+
+  deps = [
+    ":rtc_stats_api",
+  ]
+}
+
 rtc_static_library("libjingle_peerconnection") {
   cflags = []
   sources = [
@@ -59,11 +83,8 @@ rtc_static_library("libjingle_peerconnection") {
     "audiotrack.h",
     "datachannel.cc",
     "datachannel.h",
-    "datachannelinterface.h",
     "dtmfsender.cc",
     "dtmfsender.h",
-    "dtmfsenderinterface.h",
-    "jsep.h",
     "jsepicecandidate.cc",
     "jsepicecandidate.h",
     "jsepsessiondescription.cc",
@@ -76,7 +97,6 @@ rtc_static_library("libjingle_peerconnection") {
     "mediacontroller.h",
     "mediastream.cc",
     "mediastream.h",
-    "mediastreaminterface.h",
     "mediastreamobserver.cc",
     "mediastreamobserver.h",
     "mediastreamproxy.h",
@@ -88,26 +108,19 @@ rtc_static_library("libjingle_peerconnection") {
     "peerconnectionfactory.cc",
     "peerconnectionfactory.h",
     "peerconnectionfactoryproxy.h",
-    "peerconnectioninterface.h",
     "peerconnectionproxy.h",
-    "proxy.h",
     "remoteaudiosource.cc",
     "remoteaudiosource.h",
     "rtcstatscollector.cc",
     "rtcstatscollector.h",
-    "rtpparameters.h",
     "rtpreceiver.cc",
     "rtpreceiver.h",
-    "rtpreceiverinterface.h",
     "rtpsender.cc",
     "rtpsender.h",
-    "rtpsenderinterface.h",
     "sctputils.cc",
     "sctputils.h",
     "statscollector.cc",
     "statscollector.h",
-    "statstypes.cc",
-    "statstypes.h",
     "streamcollection.h",
     "videocapturertracksource.cc",
     "videocapturertracksource.h",
@@ -133,6 +146,7 @@ rtc_static_library("libjingle_peerconnection") {
 
   deps = [
     ":call_api",
+    ":libjingle_peerconnection_api",
     ":rtc_stats_api",
     "../call",
     "../media",
@@ -323,6 +337,7 @@ rtc_source_set("rtc_stats_api") {
   sources = [
     "stats/rtcstats.h",
     "stats/rtcstats_objects.h",
+    "stats/rtcstatscollectorcallback.h",
     "stats/rtcstatsreport.h",
   ]