Implement getSentBytesCount() in Cronet UrlRequest metrics

components/cronet/android/cronet_url_request_adapter.cc

Index: components/cronet/android/cronet_url_request_adapter.cc
diff --git a/components/cronet/android/cronet_url_request_adapter.cc b/components/cronet/android/cronet_url_request_adapter.cc
index 0ef0415210e6438cb3ba7e7d5f82375b9b31fbf8..e0820aa46b6db0584abd0cd4147aaa33b0d02f9b 100644
--- a/components/cronet/android/cronet_url_request_adapter.cc
+++ b/components/cronet/android/cronet_url_request_adapter.cc
@@ -430,8 +430,8 @@ void CronetURLRequestAdapter::MaybeReportMetrics(JNIEnv* env) const {
       ConvertTime(metrics.push_end, start_ticks, start_time),
       ConvertTime(metrics.receive_headers_end, start_ticks, start_time),
       ConvertTime(base::TimeTicks::Now(), start_ticks, start_time),
-      // TODO(mgersh): report total bytes sent
-      metrics.socket_reused, 0, url_request_->GetTotalReceivedBytes());
+      metrics.socket_reused, url_request_->GetTotalSentBytes(),
+      url_request_->GetTotalReceivedBytes());
 }
 
 net::URLRequest* CronetURLRequestAdapter::GetURLRequestForTesting() {