Merge 104501 - [chromium win] Creating lots of temporary canvas contexts will crash.

Source/WebCore/html/HTMLCanvasElement.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 440 matching lines @@
         return;
 #if USE(SKIA)
     if (deviceSize.width() > MaxSkiaDim || deviceSize.height() > MaxSkiaDim)
         return;
 #endif
 
     IntSize bufferSize(deviceSize.width(), deviceSize.height());
     if (!bufferSize.width() || !bufferSize.height())
         return;
 
-    RenderingMode renderingMode = shouldAccelerate(bufferSize) ? Accelerated : Unaccelerated;
+    RenderingMode renderingMode = shouldAccelerate(bufferSize) ? Accelerated : 
+#if USE(SKIA)
+        UnacceleratedNonPlatformBuffer;
+#else
+        Unaccelerated;
+#endif
     m_imageBuffer = ImageBuffer::create(bufferSize, ColorSpaceDeviceRGB, renderingMode);
     if (!m_imageBuffer)
         return;
     m_imageBuffer->context()->scale(FloatSize(bufferSize.width() / logicalSize.width(), bufferSize.height() / logicalSize.height()));
     m_imageBuffer->context()->setShadowsIgnoreTransforms(true);
     m_imageBuffer->context()->setImageInterpolationQuality(DefaultInterpolationQuality);
     m_imageBuffer->context()->setStrokeThickness(1);
 
 #if USE(JSC)
     JSC::JSLock lock(JSC::SilenceAssertionsOnly);
@@ skipping 48 matching lines @@
     FloatSize unscaledSize(width(), height());
     FloatSize deviceSize = convertLogicalToDevice(unscaledSize);
     IntSize size(deviceSize.width(), deviceSize.height());
     AffineTransform transform;
     if (size.width() && size.height())
         transform.scaleNonUniform(size.width() / unscaledSize.width(), size.height() / unscaledSize.height());
     return m_imageBuffer->baseTransform() * transform;
 }
 
 }