Re-enable GPU features except accelerated 2d canvas for GeForce 9400M on Mac.

gpu/software_rendering_list/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 47 matching lines @@
 // "contains", "beginwith", "endwith", "=".  "value" is a string.
 //
 // 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.
 
 {
   "name": "software rendering list",
   // Please update the version number whenever you change this file.
-  "version": "1.38",
+  "version": "1.39",
   "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 488 matching lines @@
       "os": {
         "type": "linux"
       },
       "multi_gpu_style": "optimus",
       "blacklist": [
         "all"
       ]
     },
     {
       "id": 38,
-      "description": "NVidia GeForce 9400M is buggy on Mac.",
+      "description": "Accelerated 2D canvas is unstable for NVidia GeForce 9400M on Lion.",
       "cr_bugs": [130495],
       "os": {
-        "type": "macosx"
+        "type": "macosx",
+        "version": {
+          "op": "=",
+          "number": "10.7"
+        }
       },
       "vendor_id": "0x10de",
       "device_id": ["0x0863"],
       "blacklist": [
-        "all"
+        "accelerated_2d_canvas"
       ]
     }
   ]
 }