Enable experimental permissions for extensions from the store.

chrome/browser/extensions/extension_browsertest.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_browsertest.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/file_path.h"
@@ skipping 158 matching lines @@
   if (!file_util::PathExists(dir_path)) {
     ADD_FAILURE() << "Extension dir not found: " << dir_path.value();
     return FilePath();
   }
 
   scoped_ptr<ExtensionCreator> creator(new ExtensionCreator());
   if (!creator->Run(dir_path,
                     crx_path,
                     FilePath(),  // no existing pem, use empty path
                     pem_path)) {
-    ADD_FAILURE() << "ExtensionCreator::Run() failed.";
+    ADD_FAILURE() << "ExtensionCreator::Run() failed: "
+                  << creator->error_message();
     return FilePath();
   }
 
   if (!file_util::PathExists(crx_path)) {
     ADD_FAILURE() << crx_path.value() << " was not created.";
     return FilePath();
   }
   return crx_path;
 }
 
@@ skipping 293 matching lines @@
         MessageLoopForUI::current()->Quit();
       }
       break;
     }
 
     default:
       NOTREACHED();
       break;
   }
 }