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

chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchUma.java

Index: chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchUma.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchUma.java b/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchUma.java
index 5dd1044979f1adda4bf98a3a8706b6df4feedf78..766cb23fe93d262589f5f8ff3d0f351388d649f5 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchUma.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchUma.java
@@ -1171,6 +1171,30 @@ public class ContextualSearchUma {
     }
 
     /**
+     * Logs the number of impressions and CTR for the previous week for the current user.
+     * @param previousWeekImpressions The number of impressions the user saw.

[Theresa, 2016/09/27 20:53:56]

nit: "The number of times the user saw the Contextual Search Bar."?

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

Done, here and below.

+     * @param previousWeekCTR The CTR expressed as a percentage.
+     */
+    public static void logPreviousWeekCTR(int previousWeekImpressions, int previousWeekCTR) {
+        RecordHistogram.recordPercentageHistogram(

[Theresa, 2016/09/27 20:53:56]

Impressions is just a regular number, not a percentage, right?

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

Nice catch!  Done here and below.

+                "Search.ContextualSearchPreviousWeekImpressions", previousWeekImpressions);
+        RecordHistogram.recordPercentageHistogram(
+                "Search.ContextualSearchPreviousWeekCTR", previousWeekCTR);
+    }
+
+    /**
+     * Logs the number of impressions and CTR for previous 28-day period for the current user.
+     * @param previous28DayImpressions The number of impressions the user saw.
+     * @param previous28DayCTR The CTR expressed as a percentage.
+     */
+    public static void logPrevious28DayCTR(int previous28DayImpressions, int previous28DayCTR) {
+        RecordHistogram.recordPercentageHistogram(
+                "Search.ContextualSearchPrevious28DayImpressions", previous28DayImpressions);
+        RecordHistogram.recordPercentageHistogram(
+                "Search.ContextualSearchPrevious28DayCTR", previous28DayCTR);
+    }
+
+    /**
      * Get the encoded value to use for the Bar Overlap histogram by encoding all the input
      * parameters.
      * @param didBarOverlap Whether the selection overlapped the Bar position.