Add OffscreenCanvas to ImageBitmapSource union typedef

third_party/WebKit/Source/core/frame/ImageBitmap.h

Index: third_party/WebKit/Source/core/frame/ImageBitmap.h
diff --git a/third_party/WebKit/Source/core/frame/ImageBitmap.h b/third_party/WebKit/Source/core/frame/ImageBitmap.h
index 9cc2b77e640c4dd88e82dfdbdc0323ad20385e8a..d6840780fbe92c6cabe6a4119d2f618e18e124eb 100644
--- a/third_party/WebKit/Source/core/frame/ImageBitmap.h
+++ b/third_party/WebKit/Source/core/frame/ImageBitmap.h
@@ -25,6 +25,7 @@ class HTMLCanvasElement;
 class HTMLVideoElement;
 class ImageData;
 class ImageDecoder;
+class OffscreenCanvas;
 
 enum AlphaDisposition {
   PremultiplyAlpha,
@@ -54,6 +55,9 @@ class CORE_EXPORT ImageBitmap final
   static ImageBitmap* create(HTMLCanvasElement*,
                              Optional<IntRect>,
                              const ImageBitmapOptions& = ImageBitmapOptions());
+  static ImageBitmap* create(OffscreenCanvas*,
+                             Optional<IntRect>,
+                             const ImageBitmapOptions& = ImageBitmapOptions());
   static ImageBitmap* create(ImageData*,
                              Optional<IntRect>,
                              const ImageBitmapOptions& = ImageBitmapOptions());
@@ -136,6 +140,7 @@ class CORE_EXPORT ImageBitmap final
               Document*,
               const ImageBitmapOptions&);
   ImageBitmap(HTMLCanvasElement*, Optional<IntRect>, const ImageBitmapOptions&);
+  ImageBitmap(OffscreenCanvas*, Optional<IntRect>, const ImageBitmapOptions&);
   ImageBitmap(ImageData*, Optional<IntRect>, const ImageBitmapOptions&);
   ImageBitmap(ImageBitmap*, Optional<IntRect>, const ImageBitmapOptions&);
   ImageBitmap(PassRefPtr<StaticBitmapImage>);