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

components/component_updater/pref_names.cc

Index: components/component_updater/pref_names.cc
diff --git a/components/component_updater/pref_names.cc b/components/component_updater/pref_names.cc
index 8306bae56ef229f839ac1c83c7c51aebe02848b6..f7ebad243f32fe39a800925669fec71a5af0fb09 100644
--- a/components/component_updater/pref_names.cc
+++ b/components/component_updater/pref_names.cc
@@ -15,6 +15,10 @@ const char kRecoveryComponentVersion[] = "recovery_component.version";
 // number of retries allowed, and goes down as attempts are made and is cleared
 // back to 0 when it successfully completes.
 const char kSwReporterExecuteTryCount[] = "software_reporter.execute_try_count";
+
+// The last time SwReporter was triggered.
+const char kSwReporterLastTimeTriggered[] =
+    "software_reporter.last_time_triggered";
 #endif
 
 }  // namespace prefs