Add skeletons for the factories to create the request coordinator and

components/offline_pages.gypi

Index: components/offline_pages.gypi
diff --git a/components/offline_pages.gypi b/components/offline_pages.gypi
index 05e128348b4814e011df2c3ca00b26968cf97add..2e1d4dd156c3911cc9263bb92a4ea315589882f4 100644
--- a/components/offline_pages.gypi
+++ b/components/offline_pages.gypi
@@ -37,6 +37,34 @@
       ],
     },
     {
+      # GN: //components/offline_pages/background:background_offliner
+      'target_name': 'background_offliner',
+      'type': 'static_library',
+      'include_dirs': [
+        '..',
+        '../..',
+      ],
+      'dependencies': [
+        '../base/base.gyp:base',
+        '../net/net.gyp:net',
+        '../url/url.gyp:url_lib',
+      ],
+      'sources': [
+        'offline_pages/background/offliner.h',
+        'offline_pages/background/offliner_factory.h',
+        'offline_pages/background/offliner_policy.h',
+        'offline_pages/background/prerenderer_offliner.cc',
+        'offline_pages/background/prerenderer_offliner.h',
+        'offline_pages/background/prerenderer_offliner_factory.cc',
+        'offline_pages/background/prerenderer_offliner_factory.h',
+        'offline_pages/background/request_coordinator.cc',
+        'offline_pages/background/request_coordinator.h',
+        'offline_pages/background/request_coordinator_factory.cc',
+        'offline_pages/background/request_coordinator_factory.h',
+        'offline_pages/background/scheduler.h',
+      ],
+    },
+    {
       # GN version: //components/offline_pages:test_support
       'target_name': 'offline_pages_test_support',
       'type': 'static_library',