Use CanvasImageSource union type instead of overloading

Source/core/html/canvas/CanvasRenderingContext2D.idl

Index: Source/core/html/canvas/CanvasRenderingContext2D.idl
diff --git a/Source/core/html/canvas/CanvasRenderingContext2D.idl b/Source/core/html/canvas/CanvasRenderingContext2D.idl
index 198cf3ade55877b017f060dcf61292783b4b5a86..1faf6e71c675fe86d4a80dee06562dea7ce6403d 100644
--- a/Source/core/html/canvas/CanvasRenderingContext2D.idl
+++ b/Source/core/html/canvas/CanvasRenderingContext2D.idl
@@ -26,14 +26,11 @@
 // http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#canvasrenderingcontext2d
 
 // FIXME: float => double throughout
-// FIXME: Use union type in drawImage and createPattern once supported:
-// http://crbug.com/372891
 typedef (HTMLImageElement or
          HTMLVideoElement or
-         HTMLCanvasElement // or
+         HTMLCanvasElement or
          // CanvasRenderingContext2D or
-         // ImageBitmap
-         ) CanvasImageSource;
+         ImageBitmap) CanvasImageSource;
 
 enum CanvasFillRule { "nonzero", "evenodd" };
 
@@ -71,9 +68,7 @@ enum CanvasFillRule { "nonzero", "evenodd" };
     [Custom] attribute object fillStyle; // (default black)
     CanvasGradient createLinearGradient(float x0, float y0, float x1, float y1);
     [RaisesException] CanvasGradient createRadialGradient(float x0, float y0, float r0, float x1, float y1, float r1);
-    [RaisesException] CanvasPattern createPattern(HTMLCanvasElement canvas, DOMString? repetitionType);
-    [RaisesException] CanvasPattern createPattern(HTMLImageElement image, DOMString? repetitionType);
-    [RaisesException] CanvasPattern createPattern(HTMLVideoElement image, DOMString? repetitionType);
+    [RaisesException] CanvasPattern createPattern(CanvasImageSource image, DOMString? repetitionType);
 
     // shadows
     attribute unrestricted float shadowOffsetX;
@@ -110,18 +105,9 @@ enum CanvasFillRule { "nonzero", "evenodd" };
     TextMetrics measureText(DOMString text);
 
     // drawing images
-    [RaisesException] void drawImage(HTMLImageElement image, unrestricted float x, unrestricted float y);
-    [RaisesException] void drawImage(HTMLImageElement image, unrestricted float x, unrestricted float y, unrestricted float width, unrestricted float height);
-    [RaisesException] void drawImage(HTMLImageElement image, unrestricted float sx, unrestricted float sy, unrestricted float sw, unrestricted float sh, unrestricted float dx, unrestricted float dy, unrestricted float dw, unrestricted float dh);
-    [RaisesException] void drawImage(HTMLCanvasElement canvas, unrestricted float x, unrestricted float y);
-    [RaisesException] void drawImage(HTMLCanvasElement canvas, unrestricted float x, unrestricted float y, unrestricted float width, unrestricted float height);
-    [RaisesException] void drawImage(HTMLCanvasElement canvas, unrestricted float sx, unrestricted float sy, unrestricted float sw, unrestricted float sh, unrestricted float dx, unrestricted float dy, unrestricted float dw, unrestricted float dh);
-    [RaisesException] void drawImage(HTMLVideoElement video, unrestricted float x, unrestricted float y);
-    [RaisesException] void drawImage(HTMLVideoElement video, unrestricted float x, unrestricted float y, unrestricted float width, unrestricted float height);
-    [RaisesException] void drawImage(HTMLVideoElement video, unrestricted float sx, unrestricted float sy, unrestricted float sw, unrestricted float sh, unrestricted float dx, unrestricted float dy, unrestricted float dw, unrestricted float dh);
-    [RuntimeEnabled=ExperimentalCanvasFeatures, RaisesException] void drawImage(ImageBitmap imageBitmap, unrestricted float x, unrestricted float y);
-    [RuntimeEnabled=ExperimentalCanvasFeatures, RaisesException] void drawImage(ImageBitmap imageBitmap, unrestricted float x, unrestricted float y, unrestricted float width, unrestricted float height);
-    [RuntimeEnabled=ExperimentalCanvasFeatures, RaisesException] void drawImage(ImageBitmap imageBitmap, unrestricted float sx, unrestricted float sy, unrestricted float sw, unrestricted float sh, unrestricted float dx, unrestricted float dy, unrestricted float dw, unrestricted float dh);
+    [RaisesException] void drawImage(CanvasImageSource image, unrestricted float x, unrestricted float y);
+    [RaisesException] void drawImage(CanvasImageSource image, unrestricted float x, unrestricted float y, unrestricted float width, unrestricted float height);
+    [RaisesException] void drawImage(CanvasImageSource image, unrestricted float sx, unrestricted float sy, unrestricted float sw, unrestricted float sh, unrestricted float dx, unrestricted float dy, unrestricted float dw, unrestricted float dh);
 
     // hit regions
     [RuntimeEnabled=ExperimentalCanvasFeatures, RaisesException] void addHitRegion(optional HitRegionOptions options);