Implement people search.

chrome/browser/ui/app_list/search/webstore_cache.h

-// Copyright 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.
-
-#ifndef CHROME_BROWSER_UI_APP_LIST_SEARCH_WEBSTORE_CACHE_H_
-#define CHROME_BROWSER_UI_APP_LIST_SEARCH_WEBSTORE_CACHE_H_
-
-#include <utility>
-
-#include "base/basictypes.h"
-#include "base/containers/mru_cache.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/time/time.h"
-
-namespace base {
-class DictionaryValue;
-}
-
-namespace app_list {
-
-// WebstoreCache manages the cache of webstore search results which should
-// be valid during an input session. This will reduce unnecessary queries
-// for typing backspace or so on.
-class WebstoreCache {
- public:
-  WebstoreCache();
-  ~WebstoreCache();
-
-  // Checks the current cache and returns the value for the |query| if it's
-  // valid. Otherwise returns NULL.
-  const base::DictionaryValue* Get(const std::string& query);
-
-  // Puts the new result to the query.
-  void Put(const std::string& query, scoped_ptr<base::DictionaryValue> result);
-
- private:
-  typedef std::pair<base::Time, base::DictionaryValue*> Payload;
-  class CacheDeletor {
-   public:
-    void operator()(Payload& payload);
-  };
-  typedef base::MRUCacheBase<std::string, Payload, CacheDeletor> Cache;
-
-  Cache cache_;
-
-  DISALLOW_COPY_AND_ASSIGN(WebstoreCache);
-};
-
-}  // namespace app_list
-
-#endif  // CHROME_BROWSER_UI_APP_LIST_SEARCH_WEBSTORE_CACHE_H_