Added Alan's CL 1398603003 and augmented with upgrade for HtmlElement and HTMLElement

tools/dom/templates/html/dartium/html_dartium.darttemplate

 // Copyright (c) 2012, 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.
 
 // DO NOT EDIT
 // Auto-generated dart:html library.
 
 /**
  * HTML elements and other resources for web-based applications that need to
  * interact with the browser and the DOM (Document Object Model).
@@ skipping 43 matching lines @@
 // Not actually used, but imported since dart:html can generate these objects.
 import 'dart:svg' as svg;
 import 'dart:svg' show svgBlinkMap;
 import 'dart:svg' show svgBlinkFunctionMap;
 import 'dart:svg' show Matrix;
 import 'dart:svg' show SvgSvgElement;
 import 'dart:web_audio' as web_audio;
 import 'dart:web_audio' show web_audioBlinkMap;
 import 'dart:web_audio' show web_audioBlinkFunctionMap;
 import 'dart:_blink' as _blink;
+import 'dart:developer';
 
 export 'dart:math' show Rectangle, Point;
 
 $!GENERATED_DART_FILES
 
 // Issue 14721, order important for WrappedEvent.
 part '$AUXILIARY_DIR/AttributeMap.dart';
 part '$AUXILIARY_DIR/CanvasImageSource.dart';
 part '$AUXILIARY_DIR/CrossFrameTypes.dart';
 part '$AUXILIARY_DIR/CssClassSet.dart';
@@ skipping 628 matching lines @@
 
 unwrap_jso(dartClass_instance) => dartClass_instance;
 wrap_jso(jsObject) => jsObject;
 make_dart_rectangle(r) => r;
 convertDartToNative_Dictionary(Map dict) => dict;
 List convertDartToNative_StringArray(List<String> input) => input;
 convertDartToNative_List(List input) => input;
 createCustomUpgrader(Type customElementClass, $this) => $this;
 
 $endif