[gtk+] (14 commits) Created branch wip/multiple-backgrounds

[Cosimo Cecchi <cosimoc src gnome org>]

The branch 'wip/multiple-backgrounds' was created.

Summary of new commits:

  101d399... styleproperty: make background-clip and background-area arr
  1ab442c... styleproperty: make background-repeat an array property
  cf362e2... styleproperty: make background-position an array property
  6218608... styleproperty: make background-size an array property
  a2491cc... styleproperty: make background-image an array value
  7953806... colorswatch: don't use the clip box directly
  03fb5af... themingbackgorund: render all background layers
  e5f8e3f... reftests: add a reftest for multiple background layers
  c0ed476... tests: add trailing commas to background-shorthand.css test
  91077b4... shorthand: use array values for shorthand properties parsin
  6fd8811... shorthand: add background-position and background-size to b
  6865d0d... csspositionvalue: make empty error value non fatal
  7daba51... shorthand: implement multiple backgrounds for the backgroun
  29b069d... tests: update background-shorthand parser test for multiple