[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 5636016729eebbb7e55b191e0ada614bafe7036c..4d4793b3c48dbee02311bd581225f4b721f2f015 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
@@ -1140,6 +1140,24 @@ public class ContextualSearchUma {
     }
 
     /**
+     * Logs the CTR for the previous week for the current user as a percentage.
+     * @param previousWeekCTR The CTR expressed as a percentage.
+     */
+    public static void logPreviousWeekCTR(int previousWeekCTR) {
+        RecordHistogram.recordPercentageHistogram(
+                "Search.ContextualSearchPreviousWeekCTR", previousWeekCTR);
+    }
+
+    /**
+     * Logs the CTR for previous 28-day period for the current user as a percentage.
+     * @param previous28DayCTR The CTR expressed as a percentage.
+     */
+    public static void logPrevious28DayCTR(int previous28DayCTR) {
+        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.