Add a temporary crash key to debug nib loading issues.

chrome/common/crash_keys.h

 // Copyright (c) 2013 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.
 
 #ifndef CHROME_COMMON_CRASH_KEYS_H_
 #define CHROME_COMMON_CRASH_KEYS_H_
 
 #include <stddef.h>
 
 #include <set>
@@ skipping 126 matching lines @@
 extern const char kNSException[];
 extern const char kNSExceptionTrace[];
 
 // In the CrApplication, records information about the current event's
 // target-action.
 extern const char kSendAction[];
 
 // In the CrApplication, records information about the current event.
 extern const char kNSEvent[];
 
+// TEMPORARY: Information about Toolbar.nib, stored right after it's supposed
+// to have loaded.  https://crbug.com/685985
+extern const char kToolbarNibInfo[];
+
 }  // namespace mac
 #endif
 
 // Numbers of active views.
 extern const char kViewCount[];
 
 // TEMPORARY: The encoder/frame details at the time a zero-length encoded frame
 // was encountered.  http://crbug.com/519022
 extern const char kZeroEncodeDetails[];
 
 }  // namespace crash_keys
 
 #endif  // CHROME_COMMON_CRASH_KEYS_H_