Add a ref-counted data holder to ArrayBufferContents

Source/platform/graphics/gpu/DrawingBuffer.cpp

 /*
  * Copyright (c) 2010, Google Inc. 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
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 840 matching lines @@
     ASSERT(!m_actualAttributes.premultipliedAlpha);
     width = size().width();
     height = size().height();
 
     Checked<int, RecordOverflow> dataSize = 4;
     dataSize *= width;
     dataSize *= height;
     if (dataSize.hasOverflowed())
         return false;
 
-    WTF::ArrayBufferContents pixels(width * height, 4, WTF::ArrayBufferContents::DontInitialize);
+    WTF::ArrayBufferContents pixels(width * height, 4, WTF::ArrayBufferContents::NotShared, WTF::ArrayBufferContents::DontInitialize);
 
     GLint fbo = 0;
     if (sourceBuffer == FrontBuffer && m_frontColorBuffer.texInfo.textureId) {
         fbo = m_context->createFramebuffer();
         m_context->bindFramebuffer(GL_FRAMEBUFFER, fbo);
         m_context->framebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_frontColorBuffer.texInfo.textureId, 0);
     } else {
         m_context->bindFramebuffer(GL_FRAMEBUFFER, framebuffer());
     }
 
@@ skipping 122 matching lines @@
 void DrawingBuffer::deleteChromiumImageForTexture(TextureInfo* info)
 {
     if (info->imageId) {
         m_context->releaseTexImage2DCHROMIUM(GL_TEXTURE_2D, info->imageId);
         m_context->destroyImageCHROMIUM(info->imageId);
         info->imageId = 0;
     }
 }
 
 } // namespace blink