Add crash keys for the installer covering simple InstallerState fields.

chrome/installer/setup/setup_constants.h

 // 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.
 
 // Defines all the command-line switches used by Chrome installer.
 
 #ifndef CHROME_INSTALLER_SETUP_SETUP_CONSTANTS_H__
 #define CHROME_INSTALLER_SETUP_SETUP_CONSTANTS_H__
 
 namespace installer {
@@ skipping 10 matching lines @@
 extern const wchar_t kMediaPlayerRegPath[];
 
 namespace switches {
 
 extern const char kDelay[];
 extern const char kSetDisplayVersionProduct[];
 extern const char kSetDisplayVersionValue[];
 
 }  // namespace switches
 
+namespace crash_keys {
+
+// Describes the version installed before starting the installer.
+extern const char kCurrentVersion[];
+
+// Describes a BrowserDistribution::Type.
+extern const char kDistributionType[];
+
+// Describes an InstallerState::Operation.
+extern const char kOperation[];
+
+// Describes an InstallerState::PackageType.
+extern const char kPackageType[];
+
+// Describes an InstallerState::Level.
+extern const char kPrivilegeLevel[];
+
+extern const char kStateKey[];
+
+}  // namespace crash_keys
+
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_SETUP_SETUP_CONSTANTS_H__