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

chrome/browser/google/google_util_chromeos.cc

Index: chrome/browser/google/google_util_chromeos.cc
diff --git a/chrome/browser/google/google_util_chromeos.cc b/chrome/browser/google/google_util_chromeos.cc
index 2892efc7240d401e517776dfc4c9dedd4ef04e96..c7ce083003e8cb65511d5dbd48d97e2b68ab02e1 100644
--- a/chrome/browser/google/google_util_chromeos.cc
+++ b/chrome/browser/google/google_util_chromeos.cc
@@ -6,6 +6,7 @@
 #include "base/bind.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
+#include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "base/task_runner_util.h"
@@ -40,12 +41,24 @@ void SetBrand(const base::Closure& callback, const std::string& brand) {
   callback.Run();
 }
 
+base::LazyInstance<std::string> g_temporary_brand = LAZY_INSTANCE_INITIALIZER;
+
 }  // namespace
 
+void SetTemporaryBrand(const std::string& brand) {
+  DCHECK(
+      !content::BrowserThread::IsWellKnownThread(content::BrowserThread::UI) ||
+      content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  g_temporary_brand.Get().assign(brand);
+}
+
 std::string GetBrand() {
   DCHECK(
       !content::BrowserThread::IsWellKnownThread(content::BrowserThread::UI) ||
       content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  // Get() should not be called as it creates an instance.
+  if (!(g_temporary_brand == NULL))
+    return g_temporary_brand.Get();
   DCHECK(g_browser_process->local_state());
   return g_browser_process->local_state()->GetString(prefs::kRLZBrand);
 }