Improve WebSocket interface by making it implement StreamSink.

tests/standalone/io/web_socket_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 
 import "package:expect/expect.dart";
@@ skipping 26 matching lines @@
 
   Future<WebSocket> createClient(int port) =>
     WebSocket.connect('${secure ? "wss" : "ws"}://$HOST_NAME:$port/');
 
   void testRequestResponseClientCloses(int totalConnections,
                                        int closeStatus,
                                        String closeReason) {
     createServer().then((server) {
       server.transform(new WebSocketTransformer()).listen((webSocket) {
         webSocket.listen(
-            webSocket.send,
+            webSocket.add,
             onDone: () {
               Expect.equals(closeStatus == null
                             ? WebSocketStatus.NO_STATUS_RECEIVED
                             : closeStatus, webSocket.closeCode);
               Expect.equals(closeReason == null ? "" : closeReason, webSocket.closeReason);
             });
         });
 
       int closeCount = 0;
       String messageText = "Hello, world!";
       for (int i = 0; i < totalConnections; i++) {
         int messageCount = 0;
         createClient(server.port).then((webSocket) {
-          webSocket.send(messageText);
+          webSocket.add(messageText);
           webSocket.listen(
               (message) {
                 messageCount++;
                 if (messageCount < 1 ) {
                   Expect.equals(messageText, message);
-                  webSocket.send(message);
+                  webSocket.add(message);
                 } else {
                   webSocket.close(closeStatus, closeReason);
                 }
               },
               onDone: () {
                 Expect.equals(closeStatus == null
                               ? WebSocketStatus.NO_STATUS_RECEIVED
                               : closeStatus, webSocket.closeCode);
                 Expect.equals("", webSocket.closeReason);
                 closeCount++;
@@ skipping 12 matching lines @@
     createServer().then((server) {
       int closeCount = 0;
       server.transform(new WebSocketTransformer()).listen((webSocket) {
         String messageText = "Hello, world!";
         int messageCount = 0;
         webSocket.listen(
             (message) {
               messageCount++;
               if (messageCount < 10) {
                 Expect.equals(messageText, message);
-                webSocket.send(message);
+                webSocket.add(message);
               } else {
                 webSocket.close(closeStatus, closeReason);
               }
             },
             onDone: () {
               Expect.equals(closeStatus == null
                             ? WebSocketStatus.NO_STATUS_RECEIVED
                             : closeStatus, webSocket.closeCode);
               Expect.equals("", webSocket.closeReason);
               closeCount++;
               if (closeCount == totalConnections) {
                 server.close();
               }
             });
-        webSocket.send(messageText);
+        webSocket.add(messageText);
       });
 
       for (int i = 0; i < totalConnections; i++) {
         createClient(server.port).then((webSocket) {
             webSocket.listen(
-                webSocket.send,
+                webSocket.add,
                 onDone: () {
                   Expect.equals(closeStatus == null
                                 ? WebSocketStatus.NO_STATUS_RECEIVED
                                 : closeStatus, webSocket.closeCode);
                   Expect.equals(closeReason == null
                                 ? ""
                                 : closeReason, webSocket.closeReason);
                 });
             });
       }
     });
   }
 
 
   void testMessageLength(int messageLength) {
     createServer().then((server) {
       Uint8List originalMessage = new Uint8List(messageLength);
       server.transform(new WebSocketTransformer()).listen((webSocket) {
         webSocket.listen(
             (message) {
               Expect.listEquals(originalMessage, message);
-              webSocket.send(message);
+              webSocket.add(message);
             });
       });
 
       createClient(server.port).then((webSocket) {
         webSocket.listen(
             (message) {
               Expect.listEquals(originalMessage, message);
               webSocket.close();
             },
             onDone: server.close);
-        webSocket.send(originalMessage);
+        webSocket.add(originalMessage);
       });
     });
   }
 
 
   void testDoubleCloseClient() {
     createServer().then((server) {
       server.transform(new WebSocketTransformer()).listen((webSocket) {
         server.close();
         webSocket.listen((_) { }, onDone: webSocket.close);
@@ skipping 101 matching lines @@
     createServer().then((server) {
       int closeCount = 0;
       server.transform(new WebSocketTransformer()).listen((webSocket) {
         String messageText = "Hello, world!";
         int messageCount = 0;
         webSocket.listen(
             (message) {
               messageCount++;
               if (messageCount < 10) {
                 Expect.equals(messageText, message);
-                webSocket.send(message);
+                webSocket.add(message);
               } else {
                 webSocket.close(closeStatus, closeReason);
               }
             },
             onDone: () {
               Expect.equals(closeStatus, webSocket.closeCode);
               Expect.equals("", webSocket.closeReason);
               closeCount++;
               if (closeCount == totalConnections) {
                 server.close();
               }
             });
-        webSocket.send(messageText);
+        webSocket.add(messageText);
       });
 
       void webSocketConnection() {
         bool onopenCalled = false;
         int onmessageCalled = 0;
         bool oncloseCalled = false;
 
         createClient(server.port).then((webSocket) {
           Expect.isFalse(onopenCalled);
           Expect.equals(0, onmessageCalled);
           Expect.isFalse(oncloseCalled);
           onopenCalled = true;
           Expect.equals(WebSocket.OPEN, webSocket.readyState);
           webSocket.listen(
               (message) {
                 onmessageCalled++;
                 Expect.isTrue(onopenCalled);
                 Expect.isFalse(oncloseCalled);
                 Expect.equals(WebSocket.OPEN, webSocket.readyState);
-                webSocket.send(message);
+                webSocket.add(message);
               },
               onDone: () {
                 Expect.isTrue(onopenCalled);
                 Expect.equals(10, onmessageCalled);
                 Expect.isFalse(oncloseCalled);
                 oncloseCalled = true;
                 Expect.equals(3002, webSocket.closeCode);
                 Expect.equals("Got tired", webSocket.closeReason);
                 Expect.equals(WebSocket.CLOSED, webSocket.readyState);
               });
         });
       }
 
       for (int i = 0; i < totalConnections; i++) {
         webSocketConnection();
       }
     });
   }
 
   testIndivitualUpgrade(int connections) {
     createServer().then((server) {
       server.listen((request) {
           if (WebSocketTransformer.isUpgradeRequest(request)) {
             WebSocketTransformer.upgrade(request).then((webSocket) {
                 webSocket.listen((_) { webSocket.close(); });
-                webSocket.send("Hello");
+                webSocket.add("Hello");
             });
           } else {
             Expect.isFalse(WebSocketTransformer.isUpgradeRequest(request));
             request.response.statusCode = HttpStatus.OK;
             request.response.close();
           }
       });
 
       var futures = [];
 
@@ skipping 57 matching lines @@
   SecureSocket.initialize(database: testPkcertDatabase.toNativePath(),
                           password: "dartdart");
 }
 
 
 main() {
   new SecurityConfiguration(secure: false).runTests();
   initializeSSL();
   new SecurityConfiguration(secure: true).runTests();
 }