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..a6cb2df1e0fb32809b7e8f6bf0e1ef7c0d6d413b 100644
--- a/third_party/WebKit/Source/core/frame/ImageBitmap.cpp
+++ b/third_party/WebKit/Source/core/frame/ImageBitmap.cpp
@@ -181,6 +181,16 @@ PassRefPtrWillBeRawPtr<ImageBitmap> ImageBitmap::create(Image* image, const IntR
     return adoptRefWillBeNoop(new ImageBitmap(image, normalizedCropRect));
 }
 
+PassRefPtrWillBeRawPtr<ImageBitmap> ImageBitmap::transfer()
+{
+    WTF::RawPtr<ImageBitmap> bitmap = adoptRefWillBeNoop(new ImageBitmap(this, m_cropRect));

[haraken, 2015/10/26 14:57:40]

RefPtrWillBeRawPtr

[xidachen, 2015/10/27 12:23:24]

Done.

+    if (m_imageElement)
+        m_imageElement.clear();
+    if (m_bitmap)
+        m_bitmap.clear();
+    return bitmap;

[haraken, 2015/10/26 14:57:40]

bitmap.release()

[xidachen, 2015/10/27 12:23:24]

junov@: I had to add back the code that sets the m_bitmapRect to be 0. The
reason is this: there is a V8ImageBitmap reference pointer that points to this
ImageBitmap object, so even though the m_bitmap is cleared, the V8ImageBitmap
pointer can still see the size of this ImageBitmap object. Actually by looking
back at this CL, I found out that the "expected.txt" is wrong starting from
Patch Set #4, which is because I didn't explicitly set the m_bitmapRect to be 0.
Now that I put it back, the "expected.txt" is correct.

[xidachen, 2015/10/27 12:23:24]

Done.

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