Revert 170319 - Removed dead code from chrome/browser/extensions/api/declarative

chrome/browser/extensions/api/declarative/rules_registry_with_cache.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/browser/extensions/api/declarative/rules_registry_with_cache.h"
 
 #include "base/logging.h"
 #include "base/stringprintf.h"
 
 namespace {
 
 const char kSuccess[] = "";
 const char kDuplicateRuleId[] = "Duplicate rule ID: %s";
 
 }  // namespace
 
 namespace extensions {
 
 RulesRegistryWithCache::RulesRegistryWithCache(Delegate* delegate)
     : delegate_(delegate) {
 }
 
+void RulesRegistryWithCache::AddReadyCallback(const base::Closure& callback) {
+  ready_callbacks_.push_back(callback);
+}
+
 void RulesRegistryWithCache::OnReady() {
   for (size_t i = 0; i < ready_callbacks_.size(); ++i)
     ready_callbacks_[i].Run();
   ready_callbacks_.clear();
 }
 
 std::string RulesRegistryWithCache::AddRules(
     const std::string& extension_id,
     const std::vector<linked_ptr<Rule> >& rules) {
   DCHECK(content::BrowserThread::CurrentlyOn(GetOwnerThread()));
@@ skipping 109 matching lines @@
     const std::string& extension_id) {
   DCHECK(content::BrowserThread::CurrentlyOn(GetOwnerThread()));
 
   if (delegate_.get())
     delegate_->OnRulesChanged(this, extension_id);
 }
 
 RulesRegistryWithCache::~RulesRegistryWithCache() {}
 
 }  // namespace extensions