Commits on Dec 14, 2017

1. layout: support tiled gradients …

   Use background-size, background-position properties to render
   CSS gradients.
   
   Some cleanup in display_list_builder.rs related to gradient
   calculations.
   
   Adds two wpt tests for tiled gradients.
   
   Note: For now even gradients with background-repeat: no-repeat
   are repeated. Sometimes the gradient is not repeated everywhere.
   
   Enable vars-background-shorthand-001.html CSS test.

   

   pyfisch committed Dec 14, 2017

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