Add a JS API for detecting WebGL availability.

chrome/common/extensions/api/extension_api.json

Index: chrome/common/extensions/api/extension_api.json
===================================================================
--- chrome/common/extensions/api/extension_api.json	(revision 112998)
+++ chrome/common/extensions/api/extension_api.json	(working copy)
@@ -8086,6 +8086,24 @@
             ]
           }
         ]
+      },
+      {
+        "name": "getWebGLStatus",
+        "description": "Invokes a callback that returns whether WebGL is blacklisted or not.",
+        "parameters": [
+          {
+            "name": "callback",
+            "type": "function",
+            "optional": "false",
+            "parameters": [
+              {
+                "name": "webgl_status",
+                "type": "string",

[Mihai Parparita -not on Chrome, 2011/12/06 02:58:11]

The type of this should be "enum", with the possible values.

[Zhenyao Mo, 2011/12/06 20:00:15]

Done.

+                "description": "Returns 'webgl_blocked' if WebGL is blacklisted; otherwise, returns 'webgl_allowed'."
+              }
+            ]
+          }
+        ]
       }
     ]
   },