| Index: chrome/android/java_staging/src/org/chromium/chrome/browser/ChromeMobileApplication.java | 
| diff --git a/chrome/android/java_staging/src/org/chromium/chrome/browser/ChromeMobileApplication.java b/chrome/android/java_staging/src/org/chromium/chrome/browser/ChromeMobileApplication.java | 
| index 0582f2238bf0d7773c42e8784059a6aec5277346..b6f95be0771ad77d048c0be61162cbc4998e12b5 100644 | 
| --- a/chrome/android/java_staging/src/org/chromium/chrome/browser/ChromeMobileApplication.java | 
| +++ b/chrome/android/java_staging/src/org/chromium/chrome/browser/ChromeMobileApplication.java | 
| @@ -24,6 +24,7 @@ import org.chromium.base.ResourceExtractor; | 
| import org.chromium.base.ThreadUtils; | 
| import org.chromium.base.VisibleForTesting; | 
| import org.chromium.base.annotations.SuppressFBWarnings; | 
| +import org.chromium.base.metrics.RecordHistogram; | 
| import org.chromium.chrome.browser.accessibility.FontSizePrefs; | 
| import org.chromium.chrome.browser.banners.AppBannerManager; | 
| import org.chromium.chrome.browser.banners.AppDetailsDelegate; | 
| @@ -61,6 +62,7 @@ import org.chromium.chrome.browser.sync.SyncController; | 
| import org.chromium.chrome.browser.tab.AuthenticatorNavigationInterceptor; | 
| import org.chromium.chrome.browser.tabmodel.document.ActivityDelegate; | 
| import org.chromium.chrome.browser.tabmodel.document.DocumentTabModelSelector; | 
| +import org.chromium.chrome.browser.util.FeatureUtilities; | 
| import org.chromium.content.browser.ChildProcessLauncher; | 
| import org.chromium.content.browser.ContentViewStatics; | 
| import org.chromium.content.browser.DownloadController; | 
| @@ -394,6 +396,11 @@ public class ChromeMobileApplication extends ChromiumApplication { | 
|  | 
| ChildProcessLauncher.onSentToBackground(); | 
| IntentHandler.clearPendingReferrer(); | 
| + | 
| +        if (FeatureUtilities.isDocumentMode(this) && sDocumentTabModelSelector != null) { | 
| +            RecordHistogram.recordCountHistogram("Tab.TotalTabCountBeforeLeavingApp", | 
| +                    sDocumentTabModelSelector.getTotalTabCount()); | 
| +        } | 
| } | 
|  | 
| /** | 
|  |