Add a method to read the Omaha experiment_labels value.

chrome/installer/util/google_update_settings.h

Index: chrome/installer/util/google_update_settings.h
diff --git a/chrome/installer/util/google_update_settings.h b/chrome/installer/util/google_update_settings.h
index 533d0bbc6668b3bc0701ffc1216a3d4b40b39e7c..0cab154348b03e0c6d5a4986dadcba25a08b32e0 100644
--- a/chrome/installer/util/google_update_settings.h
+++ b/chrome/installer/util/google_update_settings.h
@@ -257,6 +257,14 @@ class GoogleUpdateSettings {
   static bool SetExperimentLabels(bool system_install,
                                   const string16& experiment_labels);
 
+  // Reads the Omaha experiment_labels value in the ClientState key for this
+  // Chrome product and writes it into |experiment_labels|. If this distribution
+  // of Chrome does not set the experiment_labels value, this will do nothing to
+  // |experiment_labels|. This will return true if the label was successfully
+  // read.
+  static bool ReadExperimentLabels(bool system_install,
+                                   string16* experiment_labels);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(GoogleUpdateSettings);
 };