Add an installer crash key for the currently installed version.

chrome/installer/setup/installer_crash_reporting.h

Index: chrome/installer/setup/installer_crash_reporting.h
diff --git a/chrome/installer/setup/installer_crash_reporting.h b/chrome/installer/setup/installer_crash_reporting.h
index 45421945d966bba588d9537f00840d00efd2eb20..e50340ecf55788016c7bd0c45534a0002f14bd99 100644
--- a/chrome/installer/setup/installer_crash_reporting.h
+++ b/chrome/installer/setup/installer_crash_reporting.h
@@ -7,6 +7,7 @@
 
 namespace base {
 class CommandLine;
+class Version;
 }  // namespace base
 
 namespace installer {
@@ -27,6 +28,10 @@ void SetInitialCrashKeys(const InstallerState& installer_state);
 // Sets crash keys for the switches given in |command_line|.
 void SetCrashKeysFromCommandLine(const base::CommandLine& command_line);
 
+// Sets a crash key recording the version of the product which was present
+// before the installer was run.
+void SetCurrentVersionCrashKey(const base::Version* current_version);
+
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_SETUP_INSTALLER_CRASH_REPORTING_H_