Marking canvas test as pass so I can figure out what tolerances need to be adjusted.

tests/html/canvasrenderingcontext2d_test.dart

 // 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.
 
 library url_test;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
 import 'dart:html';
 
+// Some rounding errors in the browsers.
+checkPixel(Uint8ClampedArray 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));
+  expect(pixel[3], closeTo(expected[3], 1));
+}
+
 main() {
   useHtmlConfiguration();
   var canvas = new CanvasElement();
   canvas.width = 100;
   canvas.height = 100;
 
   var context = canvas.context2d;
 
   Uint8ClampedArray readPixel() {
     var imageData = context.getImageData(2, 2, 1, 1);
@@ skipping 14 matching lines @@
 
   test('setFillColorHsl hue 2', () {
     context.setFillColorHsl(240, 100, 50);
     context.fillRect(0, 0, canvas.width, canvas.height);
     expect(readPixel(), [0, 0, 255, 255]);
   });
 
   test('setFillColorHsl sat', () {
     context.setFillColorHsl(0, 0, 50);
     context.fillRect(0, 0, canvas.width, canvas.height);
-    var pixel = readPixel();
-    // Some rounding errors in the browsers.
-    expect(pixel[0], closeTo(127, 1));
-    expect(pixel[1], closeTo(127, 1));
-    expect(pixel[2], closeTo(127, 1));
-    expect(pixel[3], 255);
+    checkPixel(readPixel(), [127, 127, 127, 255]);
   });
 
   test('setStrokeColorRgb', () {
     context.setStrokeColorRgb(255, 0, 255, 1);
     context.lineWidth = 10;
     context.strokeRect(0, 0, canvas.width, canvas.height);
     expect(readPixel(), [255, 0, 255, 255]);
   });
 
   test('setStrokeColorHsl hue', () {
     context.setStrokeColorHsl(0, 100, 50);
     context.lineWidth = 10;
     context.strokeRect(0, 0, canvas.width, canvas.height);
     expect(readPixel(), [255, 0, 0, 255]);
   });
 
   test('setStrokeColorHsl hue 2', () {
     context.setStrokeColorHsl(240, 100, 50);
     context.lineWidth = 10;
     context.strokeRect(0, 0, canvas.width, canvas.height);
     expect(readPixel(), [0, 0, 255, 255]);
   });
 
   test('setStrokeColorHsl sat', () {
     context.setStrokeColorHsl(0, 0, 50);
     context.lineWidth = 10;
     context.strokeRect(0, 0, canvas.width, canvas.height);
-    var pixel = readPixel();
-    // Some rounding errors in the browsers.
-    expect(pixel[0], closeTo(127, 1));
-    expect(pixel[1], closeTo(127, 1));
-    expect(pixel[2], closeTo(127, 1));
-    expect(pixel[3], 255);
+    checkPixel(readPixel(), [127, 127, 127, 255]);
   });
 
   test('fillStyle', () {
     context.fillStyle = "red";
     context.fillRect(0, 0, canvas.width, canvas.height);
     expect(readPixel(), [255, 0, 0, 255]);
   });
 
   test('strokeStyle', () {
     context.strokeStyle = "blue";
@@ skipping 18 matching lines @@
     context.fillStyle = 'green';
     context.fillRect(0, 0, canvas.width, canvas.height);
 
     context.putImageData(expectedData, 0, 0);
 
     var resultingData = context.getImageData(0, 0, 10, 10);
     // Make sure that we read back what we wrote.
     expect(resultingData.data, expectedData.data);
   });
 }