Support for dart:typed_data

test/codegen/expect/dom/dom.js

 dart_library.library('dom/dom', window, /* Imports */[
   'dart/_runtime',
   'dart/core'
 ], /* Lazy imports */[
 ], function(exports, dart, core) {
   'use strict';
   let dartx = dart.dartx;
   class Overload extends core.Object {
     Overload() {
     }
   }
   dart.setSignature(Overload, {
     constructors: () => ({Overload: [Overload, []]})
   });
   const overload = dart.const(new Overload());
   class CustomEvent extends core.Object {}
   dart.setSignature(CustomEvent, {
     constructors: () => ({CustomEvent: [CustomEvent, [core.String], {detail: dart.dynamic, bubbles: dart.dynamic, cancelable: dart.dynamic}]})
   });
-  class HTMLCollection extends core.Object {}
+  class HTMLCollection extends core.Object {
+    get(index) {
+      return this["[]"](index);

[Jennifer Messerly, 2016/02/10 00:20:30]

Hmm. This looks a bit dubious. We never use "[]" or "[]=" as a property name as
it's hard to read. We always use "get" and "set".

I wonder if this dart2js annotation is supposed to be interpreted as "use native
indexing"

If so, we can support that. We'll need some code when we emit IndexExpression to
understand it.

Anyway would be fine to file this as a bug & cross that bridge when we get
there.

+    }
+  }
   dart.setSignature(HTMLCollection, {
     methods: () => ({get: [Element, [core.num]]})
   });
   const EventListener = dart.typedef('EventListener', () => dart.functionType(dart.void, [Event]));
   const InputElement = HTMLInputElement;
   const CanvasElement = HTMLCanvasElement;
   const DivElement = HTMLDivElement;
   const ScriptElement = HTMLScriptElement;
   class RenderingContext extends core.Object {}
   class CanvasDrawingStyles extends core.Object {
@@ skipping 16 matching lines @@
   exports.HTMLCollection = HTMLCollection;
   exports.EventListener = EventListener;
   exports.InputElement = InputElement;
   exports.CanvasElement = CanvasElement;
   exports.DivElement = DivElement;
   exports.ScriptElement = ScriptElement;
   exports.RenderingContext = RenderingContext;
   exports.CanvasDrawingStyles = CanvasDrawingStyles;
   exports.CanvasPathMethods = CanvasPathMethods;
 });