Implement CUP signing in UpdateClient.

chrome/browser/component_updater/chrome_component_updater_configurator.cc

Index: chrome/browser/component_updater/chrome_component_updater_configurator.cc
diff --git a/chrome/browser/component_updater/chrome_component_updater_configurator.cc b/chrome/browser/component_updater/chrome_component_updater_configurator.cc
index 5f60ccfe9c967b88a6aac80d4562c790ec9a65d6..fcc40d52a96f1323ac8f6a5f75f763dc16480d8a 100644
--- a/chrome/browser/component_updater/chrome_component_updater_configurator.cc
+++ b/chrome/browser/component_updater/chrome_component_updater_configurator.cc
@@ -50,6 +50,7 @@ class ChromeConfigurator : public update_client::Configurator {
       const override;
   bool DeltasEnabled() const override;
   bool UseBackgroundDownloader() const override;
+  bool UseCupSigning() const override;
   scoped_refptr<base::SequencedTaskRunner> GetSequencedTaskRunner()
       const override;
 
@@ -144,6 +145,10 @@ bool ChromeConfigurator::UseBackgroundDownloader() const {
   return configurator_impl_.UseBackgroundDownloader();
 }
 
+bool ChromeConfigurator::UseCupSigning() const {
+  return configurator_impl_.UseCupSigning();
+}
+
 // Returns a task runner to run blocking tasks. The task runner continues to run
 // after the browser shuts down, until the OS terminates the process. This
 // imposes certain requirements for the code using the task runner, such as