Implement people search.

chrome/browser/ui/app_list/search/common/webservice_search_provider.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_COMMON_WEBSERVICE_SEARCH_PROVIDER_H_
+#define CHROME_BROWSER_UI_APP_LIST_SEARCH_COMMON_WEBSERVICE_SEARCH_PROVIDER_H_
+
+#include "base/callback_forward.h"
+#include "base/strings/string16.h"
+#include "base/time/time.h"
+#include "base/timer/timer.h"
+#include "chrome/browser/ui/app_list/search/search_provider.h"
+
+class Profile;
+
+namespace app_list {
+
+// Helper class for webservice based searches.
+class WebserviceSearchProvider : public SearchProvider {
+ public:
+  explicit WebserviceSearchProvider(Profile* profile);
+  virtual ~WebserviceSearchProvider();
+
+  // Validate the query for privacy and size.
+  bool IsValidQuery(const string16& query);
+
+  // Start a query with throttling enabled.
+  void StartThrottledQuery(const base::Closure& start_query);
+
+  void set_use_throttling(bool use) { use_throttling_ = use; }
+
+ protected:
+  Profile* profile_;
+
+ private:
+  bool IsSensitiveInput(const string16& query);
+
+  // The timestamp when the last key event happened.
+  base::Time last_keytyped_;
+
+  // The timer to throttle QPS.
+  base::OneShotTimer<WebserviceSearchProvider> query_throttler_;
+
+  // The flag for tests. It prevents the throttling If set to false.
+  bool use_throttling_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebserviceSearchProvider);
+};
+
+}  // namespace app_list
+
+#endif  // CHROME_BROWSER_UI_APP_LIST_SEARCH_COMMON_WEBSERVICE_SEARCH_PROVIDER_H_