Add a ref-counted data holder to ArrayBufferContents

Source/platform/graphics/ImageBuffer.cpp

 /*
  * Copyright (c) 2008, Google Inc. All rights reserved.
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
@@ skipping 258 matching lines @@
 
 bool ImageBuffer::getImageData(Multiply multiplied, const IntRect& rect, WTF::ArrayBufferContents& contents) const
 {
     Checked<int, RecordOverflow> dataSize = 4;
     dataSize *= rect.width();
     dataSize *= rect.height();
     if (dataSize.hasOverflowed())
         return false;
 
     if (!isSurfaceValid()) {
-        WTF::ArrayBufferContents result(rect.width() * rect.height(), 4, WTF::ArrayBufferContents::ZeroInitialize);
+        WTF::ArrayBufferContents result(rect.width() * rect.height(), 4, WTF::ArrayBufferContents::NotShared, WTF::ArrayBufferContents::ZeroInitialize);
         result.transfer(contents);
         return true;
     }
 
     const bool hasStrayArea =
         rect.x() < 0
         || rect.y() < 0
         || rect.maxX() > m_surface->size().width()
         || rect.maxY() > m_surface->size().height();
     WTF::ArrayBufferContents result(
         rect.width() * rect.height(), 4,
+        WTF::ArrayBufferContents::NotShared,
         hasStrayArea
         ? WTF::ArrayBufferContents::ZeroInitialize
         : WTF::ArrayBufferContents::DontInitialize);
 
     SkAlphaType alphaType = (multiplied == Premultiplied) ? kPremul_SkAlphaType : kUnpremul_SkAlphaType;
     SkImageInfo info = SkImageInfo::Make(rect.width(), rect.height(), kRGBA_8888_SkColorType, alphaType);
 
     m_surface->willAccessPixels();
     ASSERT(canvas());
     canvas()->readPixels(info, result.data(), 4 * rect.width(), rect.x(), rect.y());
@@ skipping 75 matching lines @@
     ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
 
     Vector<char> encodedImage;
     if (!encodeImage(*this, mimeType, quality, &encodedImage))
         return "data:,";
 
     return "data:" + mimeType + ";base64," + base64Encode(encodedImage);
 }
 
 } // namespace blink