Inset and outset border coloring is incorrect on left side border.

This patch will fix this issue.
Thanks to differences on rendering between CPU X GPU, there is a 1 pixel wide
difference in the position where the top border meets the right border (as
also the right border X bottom border).

The workaround to have a test that will work on both modes is to cover the
affected area with a white div. This patch adds inset test.
Adding tests for outset.
Cropping the ref images to save some bytes (as also adjust test borders
to match results).
Update gleam, clear initial framebuffer under glutin.
Include gleam for android
Merge remote-tracking branch 'upstream/master'
Similar to groove/ridge case, inset/outset would scale the color to
decorate the border. Scale fails when the color is black (i.e. zero),
thus this patch will fix this issue by using a fixed color.
Adding inset test.
Adding outset test.