GCAPI should append to the existing experiment_labels instead of clobbering them.

chrome/installer/util/google_update_constants.h

Index: chrome/installer/util/google_update_constants.h
diff --git a/chrome/installer/util/google_update_constants.h b/chrome/installer/util/google_update_constants.h
index c24346b94c3eaa5d9a61f232a907893b327c68db..3c6e2da1f45e21acf17011061d903255309ebe51 100644
--- a/chrome/installer/util/google_update_constants.h
+++ b/chrome/installer/util/google_update_constants.h
@@ -7,6 +7,8 @@
 #ifndef CHROME_INSTALLER_UTIL_GOOGLE_UPDATE_CONSTANTS_H_
 #define CHROME_INSTALLER_UTIL_GOOGLE_UPDATE_CONSTANTS_H_
 
+#include "base/string16.h"

[Alexei Svitkine (slow), 2013/08/30 14:17:19]

I think this is "base/strings/string16.h" now.

[gab, 2013/08/30 17:53:11]

Right, my bad, done.

+
 namespace google_update {
 
 // The GUID Google Update uses to keep track of Chrome upgrades.
@@ -14,7 +16,10 @@ extern const wchar_t kChromeUpgradeCode[];
 
 // The name of the value where Google Update reads the list of experiments for
 // itself and Chrome.
-extern const wchar_t kExperimentLabels[];
+extern const char16 kExperimentLabels[];
+
+// The separator used to separate items in kExperimentLabels.
+extern const wchar_t kExperimentLabelSep[];
 
 // The GUID Google Update uses to keep track of Google Update self-upgrades.
 extern const wchar_t kGoogleUpdateUpgradeCode[];