Initial work on ImageData.data.

tests/html/canvasrenderingcontext2d_test.dart

Index: tests/html/canvasrenderingcontext2d_test.dart
diff --git a/tests/html/canvasrenderingcontext2d_test.dart b/tests/html/canvasrenderingcontext2d_test.dart
index 1e77f6c7a850c58e3c4e721de3b63cb0136a7b2b..6b88843165e5f1b94c8f8cf0fc69bac2abbd1461 100644
--- a/tests/html/canvasrenderingcontext2d_test.dart
+++ b/tests/html/canvasrenderingcontext2d_test.dart
@@ -8,7 +8,7 @@ import '../../pkg/unittest/lib/html_config.dart';
 import 'dart:html';
 
 // Some rounding errors in the browsers.
-checkPixel(Uint8ClampedArray pixel, List<int> expected) {
+checkPixel(List<int> pixel, List<int> expected) {
   expect(pixel[0], closeTo(expected[0], 1));
   expect(pixel[1], closeTo(expected[1], 1));
   expect(pixel[2], closeTo(expected[2], 1));
@@ -23,7 +23,7 @@ main() {
 
   var context = canvas.context2d;
 
-  Uint8ClampedArray readPixel() {
+  List<int> readPixel() {
     var imageData = context.getImageData(2, 2, 1, 1);
     return imageData.data;
   }