NTP - Add a histogram tracking the time to load offline content.

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 a0c2500de2d182aa32d3a340de56a08016880d57..5b47cef4cda9bfbb14ac405a3a3aeedfa95245ec 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
@@ -15,6 +15,7 @@ import android.graphics.Color;
 import android.graphics.Rect;
 import android.net.Uri;
 import android.os.Build;
+import android.os.SystemClock;
 import android.view.ContextMenu;
 import android.view.LayoutInflater;
 import android.view.Menu;
@@ -475,12 +476,17 @@ public class NewTabPage
                 }
             }
 
+            final long offlineQueryStartTime = SystemClock.elapsedRealtime();
+
             OfflinePageBridge.getForProfile(mProfile).checkPagesExistOffline(
                     urlsToCheckForOfflinePage, new Callback<Set<String>>() {
                         @Override
                         public void onResult(Set<String> urlsWithOfflinePages) {
                             urlsAvailableOffline.addAll(urlsWithOfflinePages);
                             callback.onResult(urlsAvailableOffline);
+                            RecordHistogram.recordTimesHistogram("NewTabPage.OfflineUrlsLoadTime",
+                                    SystemClock.elapsedRealtime() - offlineQueryStartTime,
+                                    TimeUnit.MILLISECONDS);
                         }
                     });
         }