Generate constructors for frog DOM

client/dom/frog/frog_dom.dart

Index: client/dom/frog/frog_dom.dart
diff --git a/client/dom/frog/frog_dom.dart b/client/dom/frog/frog_dom.dart
index 71f07905c89241fcf1d0cd1a3bf3cfdc6f43d33f..ced5e530859ab72df5fb5a5f5efe141e590a5804 100644
--- a/client/dom/frog/frog_dom.dart
+++ b/client/dom/frog/frog_dom.dart
@@ -294,7 +294,7 @@ class CanvasRenderingContext native "CanvasRenderingContext" {
 
 class CanvasRenderingContext2D extends CanvasRenderingContext native "CanvasRenderingContext2D" {
 
-  Dynamic fillStyle;
+  Object fillStyle;
 
   String font;
 
@@ -318,7 +318,7 @@ class CanvasRenderingContext2D extends CanvasRenderingContext native "CanvasRend
 
   num shadowOffsetY;
 
-  Dynamic strokeStyle;
+  Object strokeStyle;
 
   String textAlign;
 
@@ -2117,6 +2117,8 @@ class FileList native "FileList" {
 }
 
 class FileReader native "FileReader" {
+  FileReader() native;
+
 
   FileError error;
 
@@ -6107,6 +6109,8 @@ class WebKitCSSKeyframesRule extends CSSRule native "WebKitCSSKeyframesRule" {
 }
 
 class WebKitCSSMatrix native "WebKitCSSMatrix" {
+  WebKitCSSMatrix([String spec]) native;
+
 
   num a;
 
@@ -6214,6 +6218,8 @@ class WebKitMutationObserver native "WebKitMutationObserver" {
 }
 
 class WebKitPoint native "WebKitPoint" {
+  WebKitPoint(num x, num y) native;
+
 
   num x;
 
@@ -6398,6 +6404,8 @@ class WorkerNavigator native "WorkerNavigator" {
 }
 
 class XMLHttpRequest native "XMLHttpRequest" {
+  XMLHttpRequest() native;
+
 
   bool asBlob;