Fix for Issue 16069

sdk/lib/html/html_common/conversions.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.
 
 
 // Conversions for IDBKey.
 //
 // Per http://www.w3.org/TR/IndexedDB/#key-construct
 //
 // "A value is said to be a valid key if it is one of the following types: Array
@@ skipping 323 matching lines @@
 class _TypedImageData implements ImageData {
   final Uint8ClampedList data;
   final int height;
   final int width;
 
   _TypedImageData(this.data, this.height, this.width);
 }
 
 ImageData convertNativeToDart_ImageData(nativeImageData) {
 
-  // None of the native getters that return ImageData have the type ImageData
-  // since that is incorrect for FireFox (which returns a plain Object).  So we
-  // need something that tells the compiler that the ImageData class has been
-  // instantiated.
+  // None of the native getters that return ImageData are declared as returning
+  // [ImageData] since that is incorrect for FireFox, which returns a plain
+  // Object.  So we need something that tells the compiler that the ImageData
+  // class has been instantiated.
   // TODO(sra): Remove this when all the ImageData returning APIs have been
   // annotated as returning the union ImageData + Object.
   JS('ImageData', '0');
 
-  if (nativeImageData is ImageData) return nativeImageData;
+  if (nativeImageData is ImageData) {
+
+    // Fix for Issue 16069: on IE, the `data` field is a CanvasPixelArray which
+    // has Array as the constructor property.  This interferes with finding the
+    // correct interceptor.  Fix it by overwriting the constructor property.
+    var data = nativeImageData.data;
+    if (JS('bool', '#.constructor === Array', data)) {
+      if (JS('bool', 'typeof CanvasPixelArray !== "undefined"')) {
+        JS('void', '#.constructor = CanvasPixelArray', data);
+        // This TypedArray property is missing from CanvasPixelArray.
+        JS('void', '#.BYTES_PER_ELEMENT = 1', data);
+      }
+    }
+
+    return nativeImageData;
+  }
 
   // On Firefox the above test fails because [nativeImageData] is a plain
   // object.  So we create a _TypedImageData.
 
   return new _TypedImageData(
       JS('Uint8ClampedList', '#.data', nativeImageData),
       JS('var', '#.height', nativeImageData),
       JS('var', '#.width', nativeImageData));
 }
 
@@ skipping 21 matching lines @@
 const String _serializedScriptValue =
     'num|String|bool|'
     'JSExtendableArray|=Object|'
     'Blob|File|ByteBuffer|TypedData'
     // TODO(sra): Add Date, RegExp.
     ;
 const annotation_Creates_SerializedScriptValue =
     const Creates(_serializedScriptValue);
 const annotation_Returns_SerializedScriptValue =
     const Returns(_serializedScriptValue);