Add a "disabled" field for GPU Blacklist entries.

chrome/browser/resources/software_rendering_list.json

 // Determines whether certain gpu-related features are blacklisted or not.
 // A valid software_rendering_list.json file are in the format of
 // {
 //   "version": "x.y",
 //   "entries": [
 //     { // entry 1
 //     },
 //     ...
 //     { // entry n
 //     }
@@ skipping 22 matching lines @@
 //     This field is mandatory.
 // 12. "description" has the description of the entry.
 // 13. "webkit_bugs" is an array of associated webkit bug numbers.
 // 14. "cr_bugs" is an array of associated webkit bug numbers.
 // 15. "browser_version" is a VERSION structure (defined below).  If this
 //     condition is not satisfied, the entry will be ignored.  If it is not
 //     present, then the entry applies to all versions of the browser.
 // 16. "browser_channels" is a list of browser channel strings, valid values
 //     include "stable", "beta", "dev", and "canary". If the browser_channels
 //     list is not present, the entry matches all channels.
+// 17. "disabled" is a boolean. If it is present, the entry will be skipped.
+//     This can not be used in exceptions.
 //
 // VERSION includes "op" "number", and "number2".  "op" can be any of the
 // following values: "=", "<", "<=", ">", ">=", "any", "between".  "number2" is
 // only used if "op" is "between".  "number" is used for all "op" values except
 // "any". "number" and "number2" are in the format of x, x.x, x.x.x, etc.
 //
 // STRING includes "op" and "value".  "op" can be any of the following values:
 // "contains", "beginwith", "endwith", "=".  "value" is a string.
 
 {
@@ skipping 347 matching lines @@
       "driver_version": {
         "op": "<=",
         "number": "8.15.10.2202"
       },
       "blacklist": [
         "all"
       ]
     }
   ]
 }