Refactor automation messages.

chrome/common/page_type.h

Index: chrome/common/page_type.h
diff --git a/chrome/common/page_type.h b/chrome/common/page_type.h
new file mode 100644
index 0000000000000000000000000000000000000000..2a2bd1aa825fbc07bfde646e2df6cac2c7745ad0
--- /dev/null
+++ b/chrome/common/page_type.h
@@ -0,0 +1,17 @@
+// Copyright (c) 2009 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_PAGE_TYPE_H_
+#define CHROME_COMMON_PAGE_TYPE_H_
+#pragma once
+
+// The type of the page an entry corresponds to.  Used by chrome_frame and the
+// automation layer to detect the state of a TabContents.
+enum PageType {
+  NORMAL_PAGE = 0,
+  ERROR_PAGE,
+  INTERSTITIAL_PAGE
+};
+
+#endif  // CHROME_COMMON_PAGE_TYPE_H_