Added the CanvasImageSource interface, which all types that a canvas can draw

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 cc559ea315716c1da91f05c9f0ebf44e86732b90..0ceb06e795bad4937c0186941dfc0dbf0e1998d0 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -889,7 +889,7 @@ class CDataSection extends Text native "*CDATASection" {
 
 
 @DomName('HTMLCanvasElement')
-class CanvasElement extends Element native "*HTMLCanvasElement" {
+class CanvasElement extends Element implements CanvasImageSource native "*HTMLCanvasElement" {
 
   @DomName('HTMLCanvasElement.HTMLCanvasElement')
   @DocsEditable
@@ -1264,9 +1264,10 @@ class CanvasRenderingContext2D extends CanvasRenderingContext native "*CanvasRen
   @DocsEditable
   CanvasGradient createRadialGradient(num x0, num y0, num r0, num x1, num y1, num r1) native;
 
+  @JSName('drawImage')
   @DomName('CanvasRenderingContext2D.drawImage')
   @DocsEditable
-  void drawImage(canvas_OR_image_OR_video, num sx_OR_x, num sy_OR_y, [num sw_OR_width, num height_OR_sh, num dx, num dy, num dw, num dh]) native;
+  void $dom_drawImage(canvas_OR_image_OR_video, num sx_OR_x, num sy_OR_y, [num sw_OR_width, num height_OR_sh, num dx, num dy, num dw, num dh]) native;
 
   @DomName('CanvasRenderingContext2D.fill')
   @DocsEditable
@@ -1482,6 +1483,25 @@ class CanvasRenderingContext2D extends CanvasRenderingContext native "*CanvasRen
     $dom_arc(x, y, radius, startAngle, endAngle, anticlockwise);
   }
 
+  @DomName('CanvasRenderingContext2D.drawImage')
+  void drawImage(CanvasImageSource source, num x, num y) {
+    $dom_drawImage(source, x, y);
+  }
+
+  @DomName('CanvasRenderingContext2D.drawImage')
+  void drawImageAndScale(CanvasImageSource source, num x, num y, num width, num
+      height) {
+    $dom_drawImage(source, x, y, width, height);
+  }
+
+  @DomName('CanvasRenderingContext2D.drawImage')
+  void drawImageAndTransform(CanvasImageSource source, num sourceX, num sourceY,
+      num sourceWidth, num sourceHeight, num destinationX, num destinationY,
+      num destinationWidth, num destinationHeight) {
+    $dom_drawImage(source, sourceX, sourceY, sourceWidth, sourceHeight,
+        destinationX, destinationY, destinationWidth, destinationHeight);
+  }
+
 
   @DomName('CanvasRenderingContext2D.lineDashOffset')
   num get lineDashOffset => JS('num',
@@ -13458,9 +13478,8 @@ class ImageData native "*ImageData" {
 // BSD-style license that can be found in the LICENSE file.
 
 
-@DocsEditable
 @DomName('HTMLImageElement')
-class ImageElement extends Element native "*HTMLImageElement" {
+class ImageElement extends Element implements CanvasImageSource native "*HTMLImageElement" {
 
   @DomName('HTMLImageElement.HTMLImageElement')
   @DocsEditable
@@ -13527,6 +13546,7 @@ class ImageElement extends Element native "*HTMLImageElement" {
   @DomName('HTMLImageElement.y')
   @DocsEditable
   final int y;
+
 }
 // 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
@@ -23972,9 +23992,8 @@ class ValidityState native "*ValidityState" {
 // BSD-style license that can be found in the LICENSE file.
 
 
-@DocsEditable
 @DomName('HTMLVideoElement')
-class VideoElement extends MediaElement native "*HTMLVideoElement" {
+class VideoElement extends MediaElement implements CanvasImageSource native "*HTMLVideoElement" {
 
   @DomName('HTMLVideoElement.HTMLVideoElement')
   @DocsEditable
@@ -24063,6 +24082,7 @@ class VideoElement extends MediaElement native "*HTMLVideoElement" {
   @SupportedBrowser(SupportedBrowser.SAFARI)
   @Experimental
   void exitFullscreen() native;
+
 }
 // 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
@@ -29950,6 +29970,12 @@ class _DataAttributeMap implements Map<String, String> {
 // BSD-style license that can be found in the LICENSE file.
 
 
+abstract class CanvasImageSource {}
+// 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.
+
+
 /**
  * An object representing the top-level context object for web scripting.
  *