Adding ease-of-use methods to HttpRequest.

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 76d03b9c25631a481afab0dc88806a3ee4e589e4..0c038dac926bdae071ea45a99ee2e8ed3edccdcf 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -12590,6 +12590,69 @@ class HttpRequest extends EventTarget native "*XMLHttpRequest" {
       _HttpRequestUtils.get(url, onComplete, true);
 
 
+  /**
+   * Creates a URL get request for the specified `url`.
+   *
+   * The server response must be a `text/` mime type for this request to
+   * succeed.
+   */
+  static Future<String> getString(String url,
+      {bool withCredentials}) {
+    return request(url, withCredentials: withCredentials).then(
+      (xhr) {
+        return xhr.responseText;
+      });
+  }
+
+  /**
+   * Creates a URL request for the specified `url`.
+   *
+   * By default this will do an HTTP GET request, this can be overridden with
+   * [method].
+   *
+   * The Future is completed when the response is available.
+   */
+  static Future<HttpRequest> request(String url,
+      {String method, bool withCredentials, String responseType, sendData}) {
+    var completer = new Completer<String>();
+
+    var xhr = new HttpRequest();
+    if (method == null) {
+      method = 'GET';
+    }
+    xhr.open(method, url, true);
+
+    if (withCredentials != null) {
+      xhr.withCredentials = withCredentials;
+    }
+
+    if (responseType != null) {
+      xhr.responseType = responseType;
+    }
+
+    xhr.onLoad.listen((e) {
+      if (xhr.status >= 200 && xhr.status < 300 ||
+          xhr.status == 304 ) {
+        completer.complete(xhr);
+      } else {
+        completer.completeError(e);
+      }
+    });
+
+    xhr.onError.listen((e) {
+      completer.completeError(e);
+    });
+
+    if (sendData != null) {
+      xhr.send(sendData);
+    } else {
+      xhr.send();
+    }
+
+    return completer.future;
+  }
+
+
   @DomName('XMLHttpRequest.abort')
   @DocsEditable
   static const EventStreamProvider<ProgressEvent> abortEvent = const EventStreamProvider<ProgressEvent>('abort');