Make ImageBitmap Transferable

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 8dc3a51e7070dd73fd00cf08973306fd253b6a49..222193d1484e99aa031246594a9ef7ab5c3a61f5 100644
--- a/third_party/WebKit/Source/core/frame/ImageBitmap.h
+++ b/third_party/WebKit/Source/core/frame/ImageBitmap.h
@@ -41,6 +41,9 @@ public:
     int height() const { return m_cropRect.height(); }
     IntSize size() const { return m_cropRect.size(); }
 
+    bool isNeutered() const { return !m_bitmap && !m_imageElement; }
+    PassRefPtrWillBeRawPtr<ImageBitmap> transfer();
+
     ~ImageBitmap() override;
 
     // CanvasImageSource implementation
@@ -75,7 +78,6 @@ private:
     // ImageBitmaps constructed from HTMLImageElements reference the entire ImageResource and may have a non-zero bitmap offset.
     // ImageBitmaps not constructed from HTMLImageElements always pre-crop and store the image at (0, 0).
     IntPoint m_bitmapOffset;
-
 };
 
 } // namespace blink