Reland of: 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 7e5b822909b7c109cac91a7f54b752d721097ace..d45d129e413cb033bb3176c2de56b924a1f50dc4 100644
--- a/third_party/WebKit/Source/core/frame/ImageBitmap.cpp
+++ b/third_party/WebKit/Source/core/frame/ImageBitmap.cpp
@@ -87,6 +87,16 @@ ImageBitmap::ImageBitmap(Image* image, const IntRect& cropRect)
     m_image = cropImage(image->imageForCurrentFrame(), cropRect);
 }
 
+ImageBitmap::ImageBitmap(SkImage* image)
+{
+    m_image = adoptRef(image);
+}
+
+PassRefPtr<SkImage> ImageBitmap::transfer()
+{
+    return m_image.release();

[Justin Novosad, 2015/11/11 05:29:08]

From the postMessage spec: "If any object is listed in transfer more than once,
or any of the Transferable objects listed in transfer are marked as neutered,
then throw a DataCloneError exception and abort these steps."  
I suppose handling this situation is already taken care of some place else, but
here we should at least ASSERT(!isNeutered())

[xidachen, 2015/11/16 18:00:51]

Done.

+}
+
 ImageBitmap::~ImageBitmap()
 {
 }
@@ -127,6 +137,11 @@ PassRefPtrWillBeRawPtr<ImageBitmap> ImageBitmap::create(Image* image, const IntR
     return adoptRefWillBeNoop(new ImageBitmap(image, normalizedCropRect));
 }
 
+PassRefPtrWillBeRawPtr<ImageBitmap> ImageBitmap::create(SkImage* image)
+{
+    return adoptRefWillBeNoop(new ImageBitmap(image));
+}
+
 PassRefPtr<SkImage> ImageBitmap::cropImage(PassRefPtr<SkImage> image, const IntRect& cropRect)
 {
     ASSERT(image);