[gtk+] (15 commits) Created branch wip/multiple-backgrounds

[Cosimo Cecchi <cosimoc src gnome org>]

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

Summary of new commits:

  4339276... styleproperty: make background-clip and background-area arr
  63e2888... styleproperty: make background-repeat an array property
  a933ed4... styleproperty: make background-position an array property
  3bf464d... styleproperty: make background-size an array property
  9c30ad6... styleproperty: make background-image an array value
  ea3648e... colorswatch: don't use the clip box directly
  8dc747d... themingbackgorund: render all background layers
  6357526... reftests: add a reftest for multiple background layers
  13d9e0a... tests: add trailing commas to background-shorthand.css test
  a000135... shorthand: use array values for shorthand properties parsin
  38f2350... shorthand: add background-position and background-size to b
  9de815d... csspositionvalue: make empty error value non fatal
  17a0c30... shorthand: implement multiple backgrounds for the backgroun
  2ff75af... tests: update background-shorthand parser test for multiple
  ab0ebda... themingengine: render pane-separator grip only if we have n