browser/ui: Unify the enum Kind of SadTab used by SadTabViews and SabTabGtk.

chrome/browser/ui/sad_tab_types.h

Index: chrome/browser/ui/sad_tab_types.h
diff --git a/chrome/browser/ui/sad_tab_types.h b/chrome/browser/ui/sad_tab_types.h
new file mode 100644
index 0000000000000000000000000000000000000000..6b1aeeb19e02de2deb4ecb4eab47ed9b9d539f57
--- /dev/null
+++ b/chrome/browser/ui/sad_tab_types.h
@@ -0,0 +1,20 @@
+// Copyright (c) 2012 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_BROWSER_UI_SAD_TAB_TYPES_H_
+#define CHROME_BROWSER_UI_SAD_TAB_TYPES_H_
+#pragma once
+
+namespace chrome {
+
+// NOTE: Do not remove or reorder the elements in this enum, and only add new
+// items at the end. We depend on these specific values in a histogram.
+enum SadTabKind {
+  SAD_TAB_KIND_CRASHED = 0,  // Tab crashed. Display the "Aw, Snap!" page.
+  SAD_TAB_KIND_KILLED  // Tab killed. Display the "He's dead, Jim!" tab page.
+};
+
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_UI_SAD_TAB_TYPES_H_