sync: Add --enable-sync-sessions-v2 and necessary plumbing to use SessionsSyncManager.

chrome/common/chrome_switches.cc

 // 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.
 
 #include "chrome/common/chrome_switches.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 
 namespace switches {
@@ skipping 752 matching lines @@
 // Enables an experimental hosted app experience.
 const char kEnableStreamlinedHostedApps[]   = "enable-streamlined-hosted-apps";
 
 // Enables experimental suggestions pane in New Tab page.
 const char kEnableSuggestionsTabPage[]      = "enable-suggestions-ntp";
 
 // Enables synced notifications.
 const char kEnableSyncSyncedNotifications[] =
     "enable-sync-synced-notifications";
 
+// Enables sync/API based session sync implementation (in favor of legacy).
+const char kEnableSyncSessionsV2[] = "enable-sync-sessions-v2";
+
 // Enables synced articles.
 const char kEnableSyncArticles[] = "enable-sync-articles";
 
 // Enables context menu for selecting groups of tabs.
 const char kEnableTabGroupsContextMenu[]    = "enable-tab-groups-context-menu";
 
 // Enables fanciful thumbnail processing. Used with NTP for
 // instant-extended-api, where thumbnails are generally smaller.
 const char kEnableThumbnailRetargeting[]   = "enable-thumbnail-retargeting";
 
@@ skipping 858 matching lines @@
 
 // -----------------------------------------------------------------------------
 // DO NOT ADD YOUR CRAP TO THE BOTTOM OF THIS FILE.
 //
 // You were going to just dump your switches here, weren't you? Instead, please
 // put them in alphabetical order above, or in order inside the appropriate
 // ifdef at the bottom. The order should match the header.
 // -----------------------------------------------------------------------------
 
 }  // namespace switches