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

tools/dom/templates/html/impl/impl_CanvasRenderingContext2D.darttemplate

 // 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.
 
 part of $LIBRARYNAME;
 
 $(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 $!MEMBERS
 
   /**
@@ skipping 31 matching lines @@
   void setStrokeColorHsl(int h, num s, num l, [num a = 1]) {
     this.strokeStyle = 'hsla($h, $s%, $l%, $a)';
   }
 
   @DomName('CanvasRenderingContext2D.arc')
   void arc(num x,  num y,  num radius,  num startAngle, num endAngle,
       [bool anticlockwise = false]) {
     $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

[blois, 2013/03/14 16:24:10]

drawImageAtSize? Would also use destinationX, destinationY, destinationWidth,
destinationHeight.

[Andrei Mouravski, 2013/03/15 00:08:52]

Done.

+      height) {
+    $dom_drawImage(source, x, y, width, height);
+  }
+
+  @DomName('CanvasRenderingContext2D.drawImage')
+  void drawImageAndTransform(CanvasImageSource source, num sourceX, num sourceY,

[blois, 2013/03/14 16:24:10]

Might be nice to use rects here (srcRect, destRect), not sure though.

A drawImage(img, {Rect srcRect, Rect dstRect})?

[Andrei Mouravski, 2013/03/15 00:08:52]

Done.

+      num sourceWidth, num sourceHeight, num destinationX, num destinationY,
+      num destinationWidth, num destinationHeight) {
+    $dom_drawImage(source, sourceX, sourceY, sourceWidth, sourceHeight,
+        destinationX, destinationY, destinationWidth, destinationHeight);
+  }
+
 
 $if DART2JS
   @DomName('CanvasRenderingContext2D.lineDashOffset')
   num get lineDashOffset => JS('num',
       '#.lineDashOffset || #.webkitLineDashOffset', this, this);
 
   @DomName('CanvasRenderingContext2D.lineDashOffset')
   void set lineDashOffset(num value) => JS('void', 
       'typeof #.lineDashOffset != "undefined" ? #.lineDashOffset = # : '
       '#.webkitLineDashOffset = #', this, this, value, this, value);
 $endif
 }