Bug 1354000 - (Part 1) Make stylo recognize -moz-crisp-edges keyword. r=heycam

MozReview-Commit-ID: GZyvkN4HAqT

--HG--
extra : rebase_source : 7e8230c64bbd6cbdc535fea724795618df73a43d

servo/components/style/properties/longhand/inherited_box.mako.rs

@@ -70,13 +70,14 @@ ${helpers.single_keyword("color-adjust",
                          animation_type="none",
                          spec="https://drafts.csswg.org/css-color/#propdef-color-adjust")}
 
-<% image_rendering_custom_consts = { "crisp-edges": "CRISPEDGES" } %>
+<% image_rendering_custom_consts = { "crisp-edges": "CRISPEDGES",
+                                     "-moz-crisp-edges": "CRISPEDGES" } %>
 // According to to CSS-IMAGES-3, `optimizespeed` and `optimizequality` are synonyms for `auto`
 // And, firefox doesn't support `pixelated` yet (https://bugzilla.mozilla.org/show_bug.cgi?id=856337)
 ${helpers.single_keyword("image-rendering",
-                         "auto crisp-edges",
-                         extra_gecko_values="optimizespeed optimizequality",
-                         extra_servo_values="pixelated",
+                         "auto",
+                         extra_gecko_values="optimizespeed optimizequality -moz-crisp-edges",
+                         extra_servo_values="pixelated crisp-edges",
                          custom_consts=image_rendering_custom_consts,
                          animation_type="none",
                          spec="https://drafts.csswg.org/css-images/#propdef-image-rendering")}