Bug 692879. Enable Azure canvas on OS X. r=mwoodrow

modules/libpref/src/init/all.js

@@ -231,6 +231,10 @@ pref("gfx.font_rendering.directwrite.use_gdi_table_loading", true);
 
 #ifdef XP_WIN
 pref("gfx.canvas.azure.enabled", true);
+#else
+#ifdef XP_MACOSX
+pref("gfx.canvas.azure.enabled", true);
+#endif
 #endif
 
 pref("accessibility.browsewithcaret", false);