Add check to determine if HidingWindowAnimationObserver is source of crbug.com/338788

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 <set>
 #include <string>
 #include <vector>
@@ skipping 93 matching lines @@
 #endif
 
 // The user's printers, up to kPrinterInfoCount. Should be set with
 // ScopedPrinterInfo.
 const size_t kPrinterInfoCount = 4;
 extern const char kPrinterInfo[];
 
 #if defined(OS_CHROMEOS)
 // The number of simultaneous users in multi profile sessions.
 extern const char kNumberOfUsers[];
+
+// The name of an aura::Window which is still alive despite its ui::Layer being
+// destroyed.
+// TODO(pkotwicz): Remove once crbug.com/338788 is resolved.
+extern const char kNameOfWindowWithDestroyedLayer[];
 #endif
 
 #if defined(OS_MACOSX)
 namespace mac {
 
 // Used to report the first Cocoa/Mac NSException and its backtrace.
 extern const char kFirstNSException[];
 extern const char kFirstNSExceptionTrace[];
 
 // Used to report the last Cocoa/Mac NSException and its backtrace.
@@ skipping 12 matching lines @@
 // deliberate crash.
 extern const char kZombie[];
 extern const char kZombieTrace[];
 
 }  // namespace mac
 #endif
 
 }  // namespace crash_keys
 
 #endif  // CHROME_COMMON_CRASH_KEYS_H_