Make ImageBitmap Transferable

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

Index: third_party/WebKit/Source/core/frame/ImageBitmap.cpp
diff --git a/third_party/WebKit/Source/core/frame/ImageBitmap.cpp b/third_party/WebKit/Source/core/frame/ImageBitmap.cpp
index bb45b3f009b97649d272ffb1158c13e864aee62a..4d656e53e7e21f143c5dae9c963778e5e30c3cc4 100644
--- a/third_party/WebKit/Source/core/frame/ImageBitmap.cpp
+++ b/third_party/WebKit/Source/core/frame/ImageBitmap.cpp
@@ -181,6 +181,19 @@ PassRefPtrWillBeRawPtr<ImageBitmap> ImageBitmap::create(Image* image, const IntR
     return adoptRefWillBeNoop(new ImageBitmap(image, normalizedCropRect));
 }
 
+void ImageBitmap::neuter()
+{
+    if (m_imageElement)
+        m_imageElement.clear();
+    if (m_bitmap)
+        m_bitmap.clear();
+}
+
+PassRefPtrWillBeRawPtr<ImageBitmap> ImageBitmap::transfer()
+{
+    return adoptRefWillBeNoop(new ImageBitmap(this, m_cropRect));
+}
+
 void ImageBitmap::notifyImageSourceChanged()
 {
     m_bitmap = cropImage(m_imageElement->cachedImage()->image(), m_cropRect);