[Sync] Creating sync_sessions component, moving revisit logic.

components/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//tools/grit/repack.gni")
 
 # Collection of all components. You wouldn't link to this, but this is rather
@@ skipping 105 matching lines @@
       "//components/query_parser",
       "//components/rappor",
       "//components/renderer_context_menu",
       "//components/resources:components_resources",
       "//components/search_provider_logos",
       "//components/security_interstitials/core",
       "//components/sessions",
       "//components/signin/core/browser",
       "//components/startup_metric_utils",
       "//components/sync_driver",
+      "//components/sync_sessions",
       "//components/tracing",
       "//components/tracing:startup_tracing",
       "//components/translate/content/browser",
       "//components/translate/content/common",
       "//components/translate/content/renderer",
       "//components/translate/core/browser",
       "//components/translate/core/common",
       "//components/ui/zoom",
       "//components/update_client",
       "//components/upload_list",
@@ skipping 242 matching lines @@
       "//components/precache/content:unit_tests",
       "//components/precache/core:unit_tests",
       "//components/proxy_config:unit_tests",
       "//components/query_parser:unit_tests",
       "//components/rappor:unit_tests",
       "//components/search_engines:unit_tests",
       "//components/search:unit_tests",
       "//components/search_provider_logos:unit_tests",
       "//components/signin/core/browser:unit_tests",
       "//components/sync_driver:unit_tests",
+      "//components/sync_sessions:unit_tests",
       "//components/translate/core/browser:unit_tests",
       "//components/translate/core/common:unit_tests",
       "//components/translate/core/language_detection:unit_tests",
       "//components/url_formatter:unit_tests",
       "//components/url_matcher:unit_tests",
       "//components/update_client:unit_tests",
       "//components/upload_list:unit_tests",
       "//components/user_prefs/tracked:unit_tests",
       "//components/variations:unit_tests",
       "//components/wallpaper:unit_tests",
@@ skipping 196 matching lines @@
   ]
   if (!is_ios) {
     deps += [
       "//base",
       "//base/test:test_support_perf",
       "//content/test:test_support",
       "//components/visitedlink/browser",
     ]
   }
 }