Set up content in-process main threads via factory

chrome/chrome_exe.gypi

 # Copyright (c) 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': 'chrome',
       'type': 'executable',
       'mac_bundle': 1,
@@ skipping 418 matching lines @@
             # Copy Flash Player files to PRODUCT_DIR if applicable. Let the .gyp
             # file decide what to do on a per-OS basis; on Mac, internal plugins
             # go inside the framework, so this dependency is in chrome_dll.gypi.
             '../third_party/adobe/flash/flash_player.gyp:flapper_binaries',
             # Copy CDM files to PRODUCT_DIR if applicable. Let the .gyp
             # file decide what to do on a per-OS basis; on Mac, internal plugins
             # go inside the framework, so this dependency is in chrome_dll.gypi.
             '../third_party/widevine/cdm/widevine_cdm.gyp:widevinecdmadapter',
           ],
         }],
+        ['chrome_multiple_dll', {
+          'defines': ['CHROME_MULTIPLE_DLL'],
+        }],
         ['OS=="mac" and asan==1', {
           'xcode_settings': {
             # Override the outer definition of CHROMIUM_STRIP_SAVE_FILE.
             'CHROMIUM_STRIP_SAVE_FILE': 'app/app_asan.saves',
           },
         }],
         ['OS=="linux"', {
           'conditions': [
             ['branding=="Chrome"', {
               'dependencies': [
@@ skipping 188 matching lines @@
               'dependencies': [
                 'chrome_nacl_win64',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }