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

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.ntp;
 
 import android.annotation.TargetApi;
 import android.content.Context;
 import android.graphics.Canvas;
 import android.graphics.Point;
@@ skipping 619 matching lines @@
             RecordHistogram.recordTimesHistogram(
                     "Tab.NewTabOnload", loadTimeMs, TimeUnit.MILLISECONDS);
             mIsLoaded = true;
             StartupMetrics.getInstance().recordOpenedNTP();
             NewTabPageUma.recordNTPImpression(NewTabPageUma.NTP_IMPRESSION_REGULAR);
             // If not visible when loading completes, wait until onShown is received.
             if (!mTab.isHidden()) recordNTPShown();
 
             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;
                 for (int i = 0; i < items.length; i++) {
                     if (items[i].isOfflineAvailable()) {
                         RecordHistogram.recordEnumeratedHistogram(
                                 "NewTabPage.TileOfflineAvailable", i, maxNumTiles);
                     }
                 }
             }
@@ skipping 379 matching lines @@
     @Override
     public boolean shouldCaptureThumbnail() {
         return mNewTabPageView.shouldCaptureThumbnail();
     }
 
     @Override
     public void captureThumbnail(Canvas canvas) {
         mNewTabPageView.captureThumbnail(canvas);
     }
 }