Fix drawImage on Firefox and update html.status.

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 0f07ca96b9208a8af3a36809553888bb23cf3d9d..d851f4c9934f520eb63b3072bfdc2318a5097c4e 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -30647,6 +30647,10 @@ class _DataAttributeMap implements Map<String, String> {
  * If the CanvasImageSource is a [CanvasElement] then the element's bitmap is
  * used.
  *
+ * ** Note: ** Currently, all versions of Internet Explorer do not support
+ * drawing a VideoElement to a canvas. Also, you may experience problems drawing
+ * a video to a canvas in Firefox if the source of the video is a data URL.
+ *
  * See also:
  *
  *  * [CanvasImageSource](http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#image-sources-for-2d-rendering-contexts)