Reapply support for new Uint8ClampedArray in dart:dom.

tests/dom/typed_arrays_1_test.dart

Index: tests/dom/typed_arrays_1_test.dart
diff --git a/tests/dom/typed_arrays_1_test.dart b/tests/dom/typed_arrays_1_test.dart
index c071ff32fc6b9114105a322954c642b25c8105ca..65c8acedd093db69dd391fc8daaffe9cae0c2855 100644
--- a/tests/dom/typed_arrays_1_test.dart
+++ b/tests/dom/typed_arrays_1_test.dart
@@ -33,6 +33,26 @@ main() {
 
   });
 
+  test('aliasClampedTest', () {
+      var a1 = new Uint8ClampedArray.fromList([0,0,1,0x45]);
+      var a2 = new Float32Array.fromBuffer(a1.buffer);
+
+      Expect.equals(1, a2.length);
+
+      // 0x45010000 = 2048+16
+      Expect.equals(2048 + 16, a2[0]);
+
+      a1[2] = 0;
+      // 0x45000000 = 2048
+      Expect.equals(2048, a2[0]);
+
+      a1[3]--;
+      a1[2] += 128;
+      // 0x44800000 = 1024
+      Expect.equals(1024, a2[0]);
+
+  });
+
   test('typeTests', () {
       var a = new Float32Array(10);
       Expect.isTrue(a is List);