[sync] Add Sessions integration tests

chrome/test/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/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
@@ skipping 840 matching lines @@
       "../browser/sync/test/integration/printers_helper.cc",
       "../browser/sync/test/integration/printers_helper.h",
       "../browser/sync/test/integration/profile_sync_service_harness.cc",
       "../browser/sync/test/integration/profile_sync_service_harness.h",
       "../browser/sync/test/integration/quiesce_status_change_checker.cc",
       "../browser/sync/test/integration/quiesce_status_change_checker.h",
       "../browser/sync/test/integration/retry_verifier.cc",
       "../browser/sync/test/integration/retry_verifier.h",
       "../browser/sync/test/integration/search_engines_helper.cc",
       "../browser/sync/test/integration/search_engines_helper.h",
+      "../browser/sync/test/integration/session_hierarchy_match_checker.cc",
+      "../browser/sync/test/integration/session_hierarchy_match_checker.h",
       "../browser/sync/test/integration/sessions_helper.cc",
       "../browser/sync/test/integration/sessions_helper.h",
       "../browser/sync/test/integration/single_client_status_change_checker.cc",
       "../browser/sync/test/integration/single_client_status_change_checker.h",
       "../browser/sync/test/integration/status_change_checker.cc",
       "../browser/sync/test/integration/status_change_checker.h",
       "../browser/sync/test/integration/sync_app_helper.cc",
       "../browser/sync/test/integration/sync_app_helper.h",
       "../browser/sync/test/integration/sync_app_list_helper.cc",
       "../browser/sync/test/integration/sync_app_list_helper.h",
@@ skipping 4316 matching lines @@
 }
 
 if (is_win) {
   loadable_module("conflicts_dll") {
     testonly = true
     sources = [
       "conflicts/conflicts_dll.cc",
     ]
   }
 }