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..f753e04be66c1919441c75767caa10c8f83e9a3d 100644
--- a/third_party/WebKit/Source/core/frame/ImageBitmap.cpp
+++ b/third_party/WebKit/Source/core/frame/ImageBitmap.cpp
@@ -181,6 +181,27 @@ 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();
+
+    m_isNeutered = true;
+
+    m_bitmapRect.setLocation(IntPoint(0, 0));

[Justin Novosad, 2015/10/23 13:30:04]

Setting the rects and offset to 0 is overkill.

+    m_bitmapRect.setSize(IntSize(0, 0));
+    m_cropRect = m_bitmapRect;
+    m_bitmapOffset.setX(0);
+    m_bitmapOffset.setY(0);
+}
+
+PassRefPtr<ImageBitmap> ImageBitmap::transfer()
+{
+    return adoptRef(new ImageBitmap(this, m_cropRect));

[Justin Novosad, 2015/10/23 13:30:04]

Not oilpan compatible.

+}
+
 void ImageBitmap::notifyImageSourceChanged()
 {
     m_bitmap = cropImage(m_imageElement->cachedImage()->image(), m_cropRect);