ntp_tiles::metrics: Add rappor metrics for impression URLs per icon type.

chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPage.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPage.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPage.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPage.java
index 03d8041849adfcd82aa3a75ed0e6372a803507af..84a61f8dd909fc9b2d104693249940503bace7a5 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPage.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPage.java
@@ -637,13 +637,15 @@ public class NewTabPage
 
             int tileTypes[] = new int[items.length];
             int sources[] = new int[items.length];
+            String tileUrls[] = new String[items.length];
 
             for (int i = 0; i < items.length; i++) {
                 tileTypes[i] = items[i].getTileType();
                 sources[i] = items[i].getSource();
+                tileUrls[i] = items[i].getUrl();
             }
 
-            mMostVisitedSites.recordPageImpression(tileTypes, sources);
+            mMostVisitedSites.recordPageImpression(tileTypes, sources, tileUrls);
 
             if (isNtpOfflinePagesEnabled()) {
                 final int maxNumTiles = 12;