[cros] RLZ tracking can be turned off via a flag file.

chrome/browser/google/google_util_chromeos.h

Index: chrome/browser/google/google_util_chromeos.h
diff --git a/chrome/browser/google/google_util_chromeos.h b/chrome/browser/google/google_util_chromeos.h
index 94443ee30dfc8633707f60a8762a93fdaac6ed91..e8e8c0e55f9a79221e16f2a236c91d0a324e4455 100644
--- a/chrome/browser/google/google_util_chromeos.h
+++ b/chrome/browser/google/google_util_chromeos.h
@@ -16,6 +16,10 @@ namespace chromeos {
 // partner. Returns empty string if the information is not available.
 std::string GetBrand();
 
+// Sets a temporary (i.e., not persisted through browser restart) brand. Future
+// calls to GetBrand() will return |brand|.
+void SetTemporaryBrand(const std::string& brand);
+
 // Reads the brand code from a board-specific file and stores it to Local State.
 // |callback| is invoked on the calling thread after that.
 void SetBrandFromFile(const base::Closure& callback);