[Android] Add AppMenu touch duration metric.

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 0dd544b84c09c5475b775c9ed8b3928786cc19e5..5c38aaeace796cc1779cf6f0775f9d49b7b3f11d 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -22,6 +22,8 @@
       'browser/android/activity_type_id_list.h',
       'browser/android/activity_type_ids.cc',
       'browser/android/activity_type_ids.h',
+      'browser/android/appmenu/app_menu_drag_helper.cc',
+      'browser/android/appmenu/app_menu_drag_helper.h',
       'browser/android/banners/app_banner_manager.cc',
       'browser/android/banners/app_banner_manager.h',
       'browser/android/banners/app_banner_metrics_id_list.h',
@@ -2752,6 +2754,7 @@
       'android/java/src/org/chromium/chrome/browser/AccessibilityUtil.java',
       'android/java/src/org/chromium/chrome/browser/ApplicationLifetime.java',
       'android/java/src/org/chromium/chrome/browser/accessibility/FontSizePrefs.java',
+      'android/java/src/org/chromium/chrome/browser/appmenu/AppMenuDragHelper.java',
       'android/java/src/org/chromium/chrome/browser/autofill/AutofillDialogControllerAndroid.java',
       'android/java/src/org/chromium/chrome/browser/autofill/AutofillDialogResult.java',
       'android/java/src/org/chromium/chrome/browser/autofill/AutofillLogger.java',