Manage gpu feature capabilities through blacklist indepedently.

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 29 matching lines @@
 // 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.
 
 {
   "name": "software rendering list",
   // Please update the version number whenever you change this file.
-  "version": "1.12",
+  "version": "1.13",
   "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 35 matching lines @@
       "os": {
         "type": "linux"
       },
       "vendor_id": "0x1002",
       "blacklist": [
         "all"
       ]
     },
     {
       "id": 8,
-      "description": "NVIDIA GeForce FX Go5200 does not support WebGL or accelerated compositing.",
+      "description": "NVIDIA GeForce FX Go5200 is assumed to be buggy.",
       "cr_bugs": [72938],
       "os": {
         "type": "any"
       },
       "vendor_id": "0x10de",
       "device_id": ["0x0324"],
       "blacklist": [
-        "webgl",
-        "accelerated_compositing"
+        "all"
       ]
     },
     {
       "id": 10,
       "description": "NVIDIA GeForce 7300 GT on Mac does not support WebGL.",
       "cr_bugs": [73794],
       "os": {
         "type": "macosx"
       },
       "vendor_id": "0x10de",
@@ skipping 111 matching lines @@
       "description": "NVIDIA Quadro FX 1500 is buggy.",
       "cr_bugs": [84701],
       "os": {
         "type": "linux"
       },
       "vendor_id": "0x10de",
       "device_id": ["0x029e"],
       "blacklist": [
         "all"
       ]
+    },
+    {
+      "id": 19,
+      "description": "Accelerated 2d canvas and accelerated compositing are not supported in Mac OSX version 10.5.",
+      "cr_bugs": [87157],
+      "os": {
+        "type": "macosx",
+        "version": {
+          "op": "=",
+          "number": "10.5"
+        }
+      },
+      "blacklist": [
+        "accelerated_2d_canvas",
+        "accelerated_compositing"
+      ]
     }
   ]
 }