Commits on Jan 6, 2016

1. tests: Make `linear_gradients_lengths_a.html` and …

   `linear_gradients_lengths_ref.html` use `background-clip: content-box`.
   
   The tests clearly expect the background painting area to have width of
   100px, but since the default value of `background-clip` is `border-box`
   and the boxes in question have a 1-pixel border the background painting
   areas are actually 102px. This commit fixes the tests so that the width
   of the background painting area is actually 100px.

   

   pcwalton committed Jan 6, 2016
   c924230

2. layout: Take the value of `background-clip` into account when …

   determining the painting area for background images and gradients.
   
   See: https://drafts.csswg.org/css-backgrounds-3/#the-background-clip

   

   pcwalton committed Jan 6, 2016

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