Load web contents after tab is created.

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.
 
 {
   'variables': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 3609 matching lines @@
         {
           # GN: //chrome/android:chrome_android_java_enums_srcjar
           'target_name': 'profile_account_management_metrics_java',
           'type': 'none',
           'variables': {
             'source_file': 'browser/profiles/profile_metrics.h',
           },
           'includes': [ '../build/android/java_cpp_enum.gypi' ],
         },
         {
+         # GN: //chrome/android:chrome_android_java_enums_srcjar
+         'target_name': 'add_web_contents_result_java',
+         'type': 'none',
+         'variables': {
+           'source_file': 'browser/android/chrome_web_contents_delegate_android.h',
+          },
+          'includes': [ '../build/android/java_cpp_enum.gypi' ],
+        },
+        {
           # GN: //chrome/android:chrome_android_java_enums_srcjar
           'target_name': 'profile_sync_service_model_type_selection_java',
           'type': 'none',
           'variables': {
             'source_file': 'browser/sync/profile_sync_service_android.cc',
           },
           'includes': [ '../build/android/java_cpp_enum.gypi' ],
         },
         {
           # GN: //chrome/android:chrome_android_java_enums_srcjar
@@ skipping 42 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/sync_file_system/drive_backend',
             'proto_out_dir': 'chrome/browser/sync_file_system/drive_backend',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],
   ],
 }