Send the value of google_brand::GetBrand in component update checks.

components/update_client/configurator.h

Index: components/update_client/configurator.h
diff --git a/components/update_client/configurator.h b/components/update_client/configurator.h
index c8101dd086b3778f5254eaae78d2004f8ce60f5f..177c4a7771b19a5142da98b2411be356e7cc902c 100644
--- a/components/update_client/configurator.h
+++ b/components/update_client/configurator.h
@@ -65,6 +65,12 @@ class Configurator : public base::RefCountedThreadSafe<Configurator> {
   // "stable".
   virtual std::string GetChannel() const = 0;
 
+  // Returns the brand code or distribution tag that has been assigned to
+  // a partner. A brand code is a 4-character string used to identify
+  // installations that took place as a result of partner deals or website
+  // promotions.
+  virtual std::string GetBrand() const = 0;
+
   // Returns the language for the present locale. Possible return values are
   // standard tags for languages, such as "en", "en-US", "de", "fr", "af", etc.
   virtual std::string GetLang() const = 0;