What's new in the WebKitGTK 2.51.2 release?
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  - Add WebKitImage utility class that will be used for favicons and snapshots.
  - Videos with BT2100-PQ colorspace are now tone-mapped to SDR, ensuring colours
    do not appear washed out.
  - Use a run loop observer also to notify the main thread when composition is done.
  - Remove the hybrid rendering mode now that we are computing a different tile size
    for GPU and CPU rendering modes.
  - Make jsc_value_array_buffer_get_data() introspectable.
  - Restrict allowed URI protocols for media playback.
  - Add rendering and buffer formats information to webkit://gpu.
  - Enable dynamic MSAA for accelerated 2D canvas rendering.
  - Fix several crashes and rendering issues.
  - Translation updates: Slovenian, Turkish.