Introduce isSandboxedForTesting.

content/browser/resources/gpu/browser_bridge.js

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 cr.define('gpu', function() {
   /**
    * This class provides a 'bridge' for communicating between javascript and the
    * browser. When run outside of WebUI, e.g. as a regular webpage, it provides
    * synthetic data to assist in testing.
    * @constructor
    */
@@ skipping 138 matching lines @@
           }).bind(this));
     },
 
     /**
      * Returns an array of log messages issued by the GPU process, if any.
      */
     get logMessages() {
       return this.logMessages_;
     },
 
+    /**
+     * Returns the value of the "Sandboxed" row.
+     */
+    isSandboxedForTesting : function() {
+      for (i = 0; i < this.gpuInfo_.basic_info.length; ++i) {
+        var info = this.gpuInfo_.basic_info[i];
+        if (info.description == "Sandboxed")
+          return info.value;
+      }
+      return false;
+    }
   };
 
   return {
     BrowserBridge: BrowserBridge
   };
 });