[Suggestions] Moving suggestions code to a new component

chrome/browser/search/suggestions/suggestions_store.cc

-// 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.
-
-#include "chrome/browser/search/suggestions/suggestions_store.h"
-
-#include <string>
-
-#include "base/base64.h"
-#include "base/prefs/pref_service.h"
-#include "chrome/common/pref_names.h"
-#include "components/pref_registry/pref_registry_syncable.h"
-
-namespace suggestions {
-
-SuggestionsStore::SuggestionsStore(PrefService* profile_prefs)
-    : pref_service_(profile_prefs) {
-  DCHECK(profile_prefs);
-}
-
-SuggestionsStore::~SuggestionsStore() {}
-
-bool SuggestionsStore::LoadSuggestions(SuggestionsProfile* suggestions) {
-  DCHECK(suggestions);
-
-  const std::string base64_suggestions_data =
-      pref_service_->GetString(prefs::kSuggestionsData);
-  if (base64_suggestions_data.empty()) {
-    suggestions->Clear();
-    return false;
-  }
-
-  // If the decode process fails, assume the pref value is corrupt and clear it.
-  std::string suggestions_data;
-  if (!base::Base64Decode(base64_suggestions_data, &suggestions_data) ||
-      !suggestions->ParseFromString(suggestions_data)) {
-    VLOG(1) << "Suggestions data in profile pref is corrupt, clearing it.";
-    suggestions->Clear();
-    ClearSuggestions();
-    return false;
-  }
-
-  return true;
-}
-
-bool SuggestionsStore::StoreSuggestions(const SuggestionsProfile& suggestions) {
-  std::string suggestions_data;
-  if (!suggestions.SerializeToString(&suggestions_data)) return false;
-
-  std::string base64_suggestions_data;
-  base::Base64Encode(suggestions_data, &base64_suggestions_data);
-
-  pref_service_->SetString(prefs::kSuggestionsData, base64_suggestions_data);
-  return true;
-}
-
-void SuggestionsStore::ClearSuggestions() {
-  pref_service_->ClearPref(prefs::kSuggestionsData);
-}
-
-// static
-void SuggestionsStore::RegisterProfilePrefs(
-    user_prefs::PrefRegistrySyncable* registry) {
-  registry->RegisterStringPref(
-      prefs::kSuggestionsData, std::string(),
-      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
-}
-
-}  // namespace suggestions