[Android] Add enhanced bookmark opt-in flag.

chrome/browser/extensions/external_component_loader.cc

 // Copyright (c) 2013 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/browser/extensions/external_component_loader.h"
 
 #include "base/command_line.h"
 #include "base/sha1.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/bookmarks/enhanced_bookmarks_features.h"
@@ skipping 48 matching lines @@
     std::string hotwordId = extension_misc::kHotwordExtensionId;
     CommandLine* command_line = CommandLine::ForCurrentProcess();
     // TODO(amistry): Load the hotword shared module when enabling built-in
     // hotword detection.
     if (!command_line->HasSwitch(switches::kEnableExperimentalHotwording)) {
       prefs_->SetString(hotwordId + ".external_update_url",
                         extension_urls::GetWebstoreUpdateUrl().spec());
     }
   }
 
-  UpdateBookmarksExperimentState(
-      profile_->GetPrefs(),
-      g_browser_process->local_state(),
-      IsUserSignedin(profile_),
-      BOOKMARKS_EXPERIMENT_ENABLED_FROM_SYNC_UNKNOWN);
+  InitBookmarksExperimentState(profile_);
+
   std::string ext_id;
   if (GetBookmarksExperimentExtensionID(profile_->GetPrefs(), &ext_id) &&
       !ext_id.empty()) {
     prefs_->SetString(ext_id + ".external_update_url",
                       extension_urls::GetWebstoreUpdateUrl().spec());
   }
 
   LoadFinished();
 }
 
 }  // namespace extensions