What's new in the WebKitGTK 2.45.3 release?
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  - Enable offscreen canvas by default.
  - Enable ImageBitmap acceleration.
  - Add support for accelerated offscreen canvas.
  - Do not display WebGL front buffer before it's initialized.
  - Fix text scaling.
  - Add a new setting to enable or disable the 2D canvas acceleration (enabled by default).
  - Deprecate WebKitWebContext:use-system-appearance-for-scrollbars property.
  - Undeprecate and document webkit_print_operation_print() behavior.
  - Fix several crashes and rendering issues.