Add writeString method to OutputStream

samples/chat/chat_stress_client.dart

Index: samples/chat/chat_stress_client.dart
diff --git a/samples/chat/chat_stress_client.dart b/samples/chat/chat_stress_client.dart
index 0a50738db514a3eee32e8c380e3d0764a1e30e6a..0e29a7eb2721eefa55925d1fa7c177b58581824e 100644
--- a/samples/chat/chat_stress_client.dart
+++ b/samples/chat/chat_stress_client.dart
@@ -56,7 +56,7 @@ class ChatStressClient {
       leaveRequest["sessionId"] = sessionId;
       HttpClientConnection conn = httpClient.post("127.0.0.1", port, "/leave");
       conn.onRequest = (HttpClientRequest request) {
-        request.writeString(JSON.stringify(leaveRequest));
+        request.outputStream.writeString(JSON.stringify(leaveRequest));
         request.outputStream.close();
       };
       conn.onResponse = (HttpClientResponse response) {
@@ -84,9 +84,10 @@ class ChatStressClient {
       messageRequest["sessionId"] = sessionId;
       messageRequest["nextMessage"] = receiveMessageCount;
       messageRequest["maxMessages"] = 100;
-      HttpClientConnection conn = httpClient.post("127.0.0.1", port, "/receive");
+      HttpClientConnection conn =
+          httpClient.post("127.0.0.1", port, "/receive");
       conn.onRequest = (HttpClientRequest request) {
-        request.writeString(JSON.stringify(messageRequest));
+        request.outputStream.writeString(JSON.stringify(messageRequest));
         request.outputStream.close();
       };
       conn.onResponse = (HttpClientResponse response) {
@@ -121,9 +122,10 @@ class ChatStressClient {
       messageRequest["request"] = "message";
       messageRequest["sessionId"] = sessionId;
       messageRequest["message"] = "message " + sendMessageCount;
-      HttpClientConnection conn = httpClient.post("127.0.0.1", port, "/message");
+      HttpClientConnection conn =
+      httpClient.post("127.0.0.1", port, "/message");
       conn.onRequest = (HttpClientRequest request) {
-        request.writeString(JSON.stringify(messageRequest));
+        request.outputStream.writeString(JSON.stringify(messageRequest));
         request.outputStream.close();
       };
       conn.onResponse = (HttpClientResponse response) {
@@ -153,7 +155,7 @@ class ChatStressClient {
       joinRequest["handle"] = "test1";
       HttpClientConnection conn = httpClient.post("127.0.0.1", port, "/join");
       conn.onRequest = (HttpClientRequest request) {
-        request.writeString(JSON.stringify(joinRequest));
+        request.outputStream.writeString(JSON.stringify(joinRequest));
         request.outputStream.close();
       };
       conn.onResponse = (HttpClientResponse response) {