Add options to write version number to registry.

chrome/installer/util/master_preferences_constants.h

Index: chrome/installer/util/master_preferences_constants.h
diff --git a/chrome/installer/util/master_preferences_constants.h b/chrome/installer/util/master_preferences_constants.h
index 47ea88206a63a39c0610e181bfb7599c39a06f41..5a37f42c70bbdd1498827c6831a9ba0b1bf7e616 100644
--- a/chrome/installer/util/master_preferences_constants.h
+++ b/chrome/installer/util/master_preferences_constants.h
@@ -84,6 +84,9 @@ extern const char kMakeChromeDefault[];
 extern const char kMakeChromeDefaultForUser[];
 // Boolean. Expect to be run by an MSI installer. Cmd line override present.
 extern const char kMsi[];
+// String. The MSI Product ID under which the MSI stores its information.  This
+// is used to update the DisplayVersion to match Chrome's version number.
+extern const char kMsiProductId[];
 // Boolean. Support installing multiple products at once.
 extern const char kMultiInstall[];
 // Boolean. Show EULA dialog before install.