style: Implement overflow-wrap: anywhere.

Per https://github.com/w3c/csswg-drafts/issues/2682

Differential Revision: https://phabricator.services.mozilla.com/D11328

components/style/properties/data.py

@@ -324,6 +324,7 @@ class Longhand(object):
                 "Opacity",
                 "OutlineStyle",
                 "OverflowClipBox",
+                "OverflowWrap",
                 "OverscrollBehavior",
                 "Percentage",
                 "Resize",

components/style/properties/gecko.mako.rs

@@ -1419,6 +1419,7 @@ impl Clone for ${style_struct.gecko_struct_name} {
         "NonNegativeNumber": impl_simple,
         "Number": impl_simple,
         "Opacity": impl_simple,
+        "OverflowWrap": impl_simple,
         "Perspective": impl_style_coord,
         "Position": impl_position,
         "RGBAColor": impl_rgba_color,

components/style/properties/longhands/inherited_text.mako.rs

@@ -61,15 +61,16 @@ ${helpers.predefined_type(
     servo_restyle_damage = "reflow",
 )}
 
-// Also known as "word-wrap" (which is more popular because of IE), but this is the preferred
-// name per CSS-TEXT 6.2.
-${helpers.single_keyword(
+// Also known as "word-wrap" (which is more popular because of IE), but this is
+// the preferred name per CSS-TEXT 6.2.
+${helpers.predefined_type(
     "overflow-wrap",
-    "normal break-word",
-    gecko_constant_prefix="NS_STYLE_OVERFLOWWRAP",
+    "OverflowWrap",
+    "computed::OverflowWrap::Normal",
     animation_value_type="discrete",
     spec="https://drafts.csswg.org/css-text/#propdef-overflow-wrap",
     alias="word-wrap",
+    needs_context=False,
     servo_restyle_damage="rebuild_and_reflow",
 )}