Trigger the SW reporter to run once a week for users with UMA enabled.

chrome/browser/metrics/chrome_metrics_service_accessor.h

Index: chrome/browser/metrics/chrome_metrics_service_accessor.h
diff --git a/chrome/browser/metrics/chrome_metrics_service_accessor.h b/chrome/browser/metrics/chrome_metrics_service_accessor.h
index d64f4c6f561b026279bdb10238c57bc454bfee61..edb5d2a205648484fcebf90e7d156bdb7d7112e4 100644
--- a/chrome/browser/metrics/chrome_metrics_service_accessor.h
+++ b/chrome/browser/metrics/chrome_metrics_service_accessor.h
@@ -12,6 +12,7 @@
 #include "base/macros.h"
 #include "chrome/browser/metrics/metrics_service_accessor.h"
 
+class PrefService;
 class Profile;
 
 namespace {
@@ -19,6 +20,12 @@ class CrashesDOMHandler;
 class FlashDOMHandler;
 }
 
+namespace component_updater {
+class ComponentUpdateService;
+void RegisterSwReporterComponent(ComponentUpdateService* cus,
+                                 PrefService* prefs);
+}
+
 namespace extensions {
 class ExtensionDownloader;
 class ManifestFetchData;
@@ -38,6 +45,9 @@ class ChromeInternalLogSource;
 // as a 'friend' below.
 class ChromeMetricsServiceAccessor : public MetricsServiceAccessor {
  private:
+  friend void component_updater::RegisterSwReporterComponent(
+      component_updater::ComponentUpdateService* cus,
+      PrefService* prefs);
   friend bool prerender::IsOmniboxEnabled(Profile* profile);
   friend class ChromeRenderMessageFilter;
   friend class ::CrashesDOMHandler;