WebKit2.Settings.enable_accelerated_2d_canvas

Settings.enable_accelerated_2d_canvas: Boolean (Read / Write / Construct)
  

Enable or disable accelerated 2D canvas. Accelerated 2D canvas is only available if WebKitGTK+ was compiled with a version of Cairo including the unstable CairoGL API. When accelerated 2D canvas is enabled, WebKit may render some 2D canvas content using hardware accelerated drawing operations.

Since 2.2