Add Data Saver support to Cronet

components/cronet/android/cronet_url_request.cc

Index: components/cronet/android/cronet_url_request.cc
diff --git a/components/cronet/android/cronet_url_request.cc b/components/cronet/android/cronet_url_request.cc
index 04489bfce73fe7c108f2c4ee7517424f609f2fac..811d1189a4d8b7e8293a1fc761d2dc91c0cbe7a1 100644
--- a/components/cronet/android/cronet_url_request.cc
+++ b/components/cronet/android/cronet_url_request.cc
@@ -256,6 +256,17 @@ static jstring GetNegotiatedProtocol(JNIEnv* env,
       env, request_adapter->GetNegotiatedProtocol()).Release();
 }
 
+static jstring GetProxyServer(JNIEnv* env,
+                              jobject jurl_request,
+                              jlong jurl_request_adapter) {
+  DCHECK(jurl_request_adapter);
+  CronetURLRequestAdapter* request_adapter =
+      reinterpret_cast<CronetURLRequestAdapter*>(jurl_request_adapter);
+  DCHECK(request_adapter->IsOnNetworkThread());
+  return ConvertUTF8ToJavaString(
+      env, request_adapter->GetProxyServer()).Release();
+}
+
 static jboolean GetWasCached(JNIEnv* env,
                              jobject jurl_request,
                              jlong jurl_request_adapter) {