Add "panel_fitting" GPU feature type and use it for mirror mode.

content/browser/gpu/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 23 matching lines @@
 // 13. "perf_gaming" is a FLOAT structure (defined below).
 // 14. "perf_overall" is a FLOAT structure (defined below).
 // 15. "machine_model" contais "name" and an optional "version".  "name" is a 
 //     STRING structure and "version" is a VERSION structure (defined below).
 // 16. "gpu_count" is a INT structure (defined below).
 // 17  "cpu_info" is a STRING structure (defined below).
 // 18. "exceptions" is a list of entries.
 // 19. "blacklist" is a list of gpu feature strings, valid values include
 //     "accelerated_2d_canvas", "accelerated_compositing", "webgl",
 //     "multisampling", "flash_3d", "flash_stage3d", "texture_sharing",
-//     "accelerated_video_decode", and "all".
+//     "accelerated_video_decode", "panel_fitting", and "all".
 //     This field is mandatory.
 // 20. "description" has the description of the entry.
 // 21. "webkit_bugs" is an array of associated webkit bug numbers.
 // 22. "cr_bugs" is an array of associated webkit bug numbers.
 // 23. "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.
 // 24. "disabled" is a boolean. If it is present, the entry will be skipped.
 //     This can not be used in exceptions.
 //
@@ skipping 12 matching lines @@
 //
 // FLOAT includes "op" "value", and "value2".  "op" can be any of the
 // following values: "=", "<", "<=", ">", ">=", "any", "between".  "value2" is
 // only used if "op" is "between".  "value" is used for all "op" values except
 // "any". "value" and "value2" are valid float numbers.
 // INT is very much like FLOAT, except that the values need to be integers.
 
 {
   "name": "software rendering list",
   // Please update the version number whenever you change this file.
-  "version": "3.8",
+  "version": "3.9",
   "entries": [
     {
       "id": 1,
       "description": "ATI Radeon X1900 is not compatible with WebGL on the Mac.",
       "webkit_bugs": [47028],
       "os": {
         "type": "macosx"
       },
       "vendor_id": "0x1002",
       "device_id": ["0x7249"],
@@ skipping 760 matching lines @@
       "driver_vendor": {
         "op": "=",
         "value": "NVIDIA"
       },
       "blacklist": [
         "accelerated_video",
         "accelerated_video_decode",
         "flash_3d",
         "flash_stage3d"
       ]
+    },
+    {
+      "id": 57,
+      "description": "Enable panel fitting capability on ChromeOS only on Ivy Bridge Graphics Controller.",
+      "exceptions": [
+        {
+          "os": {
+            "type": "chromeos"
+          },
+          "vendor_id": "0x8086",
+          "device_id": ["0x0166"]
+        }
+      ],
+      "blacklist": [
+        "panel_fitting"
+      ]
     }
   ]
 }