[Sync] Componentize synced_tab_delegate

components/sync_sessions.gypi

 # Copyright 2015 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': [
     {
       # GN version: //components/sync_sessions
       'target_name': 'sync_sessions',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         '../base/base.gyp:base',
         '../sync/sync.gyp:sync',
         'bookmarks_browser',
         'history_core_browser',
         'sync_driver',
       ],
       'sources': [
         # Note: sources list duplicated in GN build.
         'sync_sessions/favicon_cache.cc',
         'sync_sessions/favicon_cache.h',
         'sync_sessions/revisit/bookmarks_by_url_provider_impl.cc',
         'sync_sessions/revisit/bookmarks_by_url_provider_impl.h',
         'sync_sessions/revisit/bookmarks_page_revisit_observer.cc',
         'sync_sessions/revisit/bookmarks_page_revisit_observer.h',
+        'sync_sessions/synced_tab_delegate.cc',
+        'sync_sessions/synced_tab_delegate.h',
+        'sync_sessions/sync_sessions_client.cc',
+        'sync_sessions/sync_sessions_client.h',
         'sync_sessions/revisit/current_tab_matcher.cc',
         'sync_sessions/revisit/current_tab_matcher.h',
         'sync_sessions/revisit/offset_tab_matcher.cc',
         'sync_sessions/revisit/offset_tab_matcher.h',
         'sync_sessions/revisit/page_equality.h',
         'sync_sessions/revisit/page_visit_observer.h',
         'sync_sessions/revisit/sessions_page_revisit_observer.cc',
         'sync_sessions/revisit/sessions_page_revisit_observer.h',
         'sync_sessions/revisit/typed_url_page_revisit_observer.cc',
         'sync_sessions/revisit/typed_url_page_revisit_observer.h',
         'sync_sessions/revisit/typed_url_page_revisit_task.cc',
         'sync_sessions/revisit/typed_url_page_revisit_task.h',
       ],
       'conditions': [
         ['OS!="ios"', {
           'dependencies': [
             'sessions_content',
           ],
         }, {  # OS==ios
           'dependencies': [
             'sessions_ios',
           ],
         }],
       ],
     },
-  ],
+    {
+      'target_name': 'sync_sessions_test_support',
+      'type': 'static_library',
+      'dependencies': [
+        'sync_sessions',
+        '../base/base.gyp:base',
+        '../sync/sync.gyp:sync',
+        '../testing/gtest.gyp:gtest',
+      ],
+      'include_dirs': [
+        '..',
+      ],
+      'sources': [
+        'sync_sessions/fake_sync_sessions_client.cc',
+        'sync_sessions/fake_sync_sessions_client.h',
+      ],
+    }
+  ]
 }