Adding HttpRequest method to make it easier to post form data.

tools/dom/templates/html/impl/impl_XMLHttpRequest.darttemplate

Index: tools/dom/templates/html/impl/impl_XMLHttpRequest.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_XMLHttpRequest.darttemplate b/tools/dom/templates/html/impl/impl_XMLHttpRequest.darttemplate
index 492fcc9a6ff7c944fe8e0e28e376f65fb9210219..0c08cde381685e3eefecfb96ac4531c4164421f4 100644
--- a/tools/dom/templates/html/impl/impl_XMLHttpRequest.darttemplate
+++ b/tools/dom/templates/html/impl/impl_XMLHttpRequest.darttemplate
@@ -52,6 +52,40 @@ $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
   }
 
   /**
+   * Makes a server POST request with the specified data encoded as form data.
+   *
+   * This is similar to sending a FormData object but with broader browser
+   * support but only supports string values.

[Emily Fortuna, 2013/08/05 19:43:45]

one of the two "but"s should be removed/replaced in this sentence.

[blois, 2013/08/05 19:50:49]

Done.

+   *
+   * See also:
+   *
+   * * [request]
+   */
+  static Future<HttpRequest> postFormData(String url, Map<String, String> data,
+      {bool withCredentials, String responseType,
+      Map<String, String> requestHeaders,
+      void onProgress(ProgressEvent e)}) {
+
+    var parts = [];
+    data.forEach((key, value) {
+      parts.add('${Uri.encodeQueryComponent(key)}='
+          '${Uri.encodeQueryComponent(value)}');
+    });
+    var formData = parts.join('&');
+
+    if (requestHeaders == null) {
+      requestHeaders = <String, String>{};
+    }
+    requestHeaders.putIfAbsent('Content-Type',
+        () => 'application/x-www-form-urlencoded; charset=UTF-8');
+
+    return request(url, method: 'POST', withCredentials: withCredentials,
+        responseType: responseType,
+        requestHeaders: requestHeaders, sendData: formData,
+        onProgress: onProgress);
+  }
+
+  /**
    * Creates a URL request for the specified [url].
    *
    * By default this will do an HTTP GET request, this can be overridden with