[TTS] Record CTR by week and 28-day intervals.

components/contextual_search/browser/ctr_aggregator.h

Index: components/contextual_search/browser/ctr_aggregator.h
diff --git a/components/contextual_search/browser/ctr_aggregator.h b/components/contextual_search/browser/ctr_aggregator.h
index a799075042fa7c707380f3eb4e556edefbe1a2ed..df0403e7a2560b2c12cbdef2fd80f0c1e716740a 100644
--- a/components/contextual_search/browser/ctr_aggregator.h
+++ b/components/contextual_search/browser/ctr_aggregator.h
@@ -44,6 +44,10 @@ class CTRAggregator {
   // Records an impression.  Records a click if |did_click| is true.
   void RecordImpression(bool did_click);
 
+  // Returns the week number for the current week, useful for checking when the

[Theresa, 2016/09/27 20:53:57]

nit: "Returns the number for the current week. Useful for checking..."
?

[Donn Denman, 2016/09/28 00:38:43]

Done.

+  // current week changes.
+  int GetCurrentWeekNumber();
+
   // Returns whether we have the previous week's data for this user.
   bool HasPreviousWeekData();