Support map in generated dart:html files.

client/html/generated/src/wrapping/_CanvasPixelArrayWrappingImplementation.dart

Index: client/html/generated/src/wrapping/_CanvasPixelArrayWrappingImplementation.dart
diff --git a/client/html/generated/src/wrapping/_CanvasPixelArrayWrappingImplementation.dart b/client/html/generated/src/wrapping/_CanvasPixelArrayWrappingImplementation.dart
index a4085de77c80a9e4385b28863318d12b7073ede2..d04d6b8a1797534cd552cbb4c61bc06c3b3408ba 100644
--- a/client/html/generated/src/wrapping/_CanvasPixelArrayWrappingImplementation.dart
+++ b/client/html/generated/src/wrapping/_CanvasPixelArrayWrappingImplementation.dart
@@ -62,6 +62,10 @@ class CanvasPixelArrayWrappingImplementation extends DOMWrapperBase implements C
     _Collections.forEach(this, f);
   }
 
+  Collection map(f(int element)) {
+    return _Collections.map(this, [], f);
+  }
+
   Collection<int> filter(bool f(int element)) {
     return _Collections.filter(this, new List<int>(), f);
   }