Add history popup when long pressing on the back key.

chrome/chrome_browser.gypi

 # Copyright 2012 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 3100 matching lines @@
           'type': 'none',
           'sources': [
             'android/java/src/org/chromium/chrome/browser/autofill/AutofillPopupGlue.java',
             'android/java/src/org/chromium/chrome/browser/ChromeBrowserProvider.java',
             'android/java/src/org/chromium/chrome/browser/ChromeHttpAuthHandler.java',
             'android/java/src/org/chromium/chrome/browser/ChromeWebContentsDelegateAndroid.java',
             'android/java/src/org/chromium/chrome/browser/ContentViewUtil.java',
             'android/java/src/org/chromium/chrome/browser/DevToolsServer.java',
             'android/java/src/org/chromium/chrome/browser/IntentHelper.java',
             'android/java/src/org/chromium/chrome/browser/JavascriptAppModalDialog.java',
+            'android/java/src/org/chromium/chrome/browser/NavigationPopup.java',
             'android/java/src/org/chromium/chrome/browser/ProcessUtils.java',
             'android/java/src/org/chromium/chrome/browser/TabBase.java',
             'android/java/src/org/chromium/chrome/browser/database/SQLiteCursor.java',
           ],
           'variables': {
             'jni_gen_dir': 'chrome',
           },
           'includes': [ '../build/jni_generator.gypi' ],
         },
       ],
@@ skipping 27 matching lines @@
             'proto_in_dir': '../third_party/cros_system_api/dbus',
             'proto_out_dir': 'chrome/browser/media_transfer_protocol',
           },
           'includes': ['../build/protoc.gypi'],
         },
       ],
      },
     ],
   ],
 }