Statically allocate extension download lookups.

chrome/browser/extensions/api/downloads/downloads_api.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_DOWNLOADS_DOWNLOADS_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_DOWNLOADS_DOWNLOADS_API_H_
 
 #include <memory>
 #include <set>
 #include <string>
+#include <utility>
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/scoped_observer.h"
 #include "base/time/time.h"
 #include "chrome/browser/download/download_danger_prompt.h"
 #include "chrome/browser/download/download_path_reservation_tracker.h"
+#include "chrome/browser/download/download_query.h"
 #include "chrome/browser/extensions/chrome_extension_function.h"
 #include "chrome/common/extensions/api/downloads.h"
 #include "content/public/browser/all_download_item_notifier.h"
 #include "content/public/browser/download_manager.h"
 #include "extensions/browser/event_router.h"
 #include "extensions/browser/extension_registry_observer.h"
 #include "extensions/browser/warning_set.h"
 
 class DownloadFileIconExtractor;
 
@@ skipping 369 matching lines @@
   base::Time last_checked_removal_;
 
   // Listen to extension unloaded notifications.
   ScopedObserver<extensions::ExtensionRegistry,
                  extensions::ExtensionRegistryObserver>
       extension_registry_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionDownloadsEventRouter);
 };
 
+using DownloadQueryFilterTypePair =
+    std::pair<const char*, DownloadQuery::FilterType>;
+using DownloadQuerySortTypePair =
+    std::pair<const char*, DownloadQuery::SortType>;
+
+// Finds the given filter/sort type pair for the string, or returns nullptr if
+// the string was not found.
+const DownloadQueryFilterTypePair* FindDownloadFilterTypeByString(
+    const char* key);
+const DownloadQuerySortTypePair* FindDownloadSortTypeByString(const char* key);
+
+#if defined(UNIT_TEST)
+
+// These functions return the beginning and end of the respective filter and
+// sort type maps for the purposes of unit testing that the lists are sorted.
+const DownloadQueryFilterTypePair* DownloadQueryFilterTypeBeginForTest();
+const DownloadQueryFilterTypePair* DownloadQueryFilterTypeEndForTest();
+const DownloadQuerySortTypePair* DownloadQuerySortTypeBeginForTest();
+const DownloadQuerySortTypePair* DownloadQuerySortTypeEndForTest();
+
+#endif  // defined(UNIT_TEST);
+
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DOWNLOADS_DOWNLOADS_API_H_