Add Java binding for new getStats implementation.

webrtc/sdk/android/BUILD.gn

Index: webrtc/sdk/android/BUILD.gn
diff --git a/webrtc/sdk/android/BUILD.gn b/webrtc/sdk/android/BUILD.gn
index 7e2a7cd95b4009d9be0881572f76e892ad9cab7d..d0581a413a4ef58c16bd5a08e2ca10e36595c80a 100644
--- a/webrtc/sdk/android/BUILD.gn
+++ b/webrtc/sdk/android/BUILD.gn
@@ -42,6 +42,8 @@ rtc_static_library("libjingle_peerconnection_jni") {
     "src/jni/native_handle_impl.cc",
     "src/jni/native_handle_impl.h",
     "src/jni/peerconnection_jni.cc",
+    "src/jni/rtcstatscollectorcallbackwrapper.cc",
+    "src/jni/rtcstatscollectorcallbackwrapper.h",
     "src/jni/surfacetexturehelper_jni.cc",
     "src/jni/surfacetexturehelper_jni.h",
   ]
@@ -160,6 +162,9 @@ android_library("libjingle_peerconnection_java") {
     "api/org/webrtc/PeerConnection.java",
     "api/org/webrtc/PeerConnectionFactory.java",
     "api/org/webrtc/RendererCommon.java",
+    "api/org/webrtc/RTCStats.java",
+    "api/org/webrtc/RTCStatsCollectorCallback.java",
+    "api/org/webrtc/RTCStatsReport.java",
     "api/org/webrtc/RtpParameters.java",
     "api/org/webrtc/RtpReceiver.java",
     "api/org/webrtc/RtpSender.java",