ChromeOS: Support opening files with apps from the downloads page.

chrome/browser/chromeos/extensions/file_manager/file_handler_util.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_CHROMEOS_EXTENSIONS_FILE_MANAGER_FILE_HANDLER_UTIL_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_FILE_HANDLER_UTIL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 21 matching lines @@
 typedef std::vector<const FileBrowserHandler*> FileBrowserHandlerList;
 
 // Specifies the task type for a task id that represents some file action, Drive
 // action, or Web Intent action.
 extern const char kTaskFile[];
 extern const char kTaskDrive[];
 extern const char kTaskApp[];
 
 void UpdateFileHandlerUsageStats(Profile* profile, const std::string& task_id);
 
+// Returns true if the task should be used as a fallback. Such tasks are
+// Files.app's internal handlers as well as quick office extensions.
+bool IsFallbackTask(const FileBrowserHandler* task);
+
 // Update the default file handler for the given sets of suffixes and MIME
 // types.
 void UpdateDefaultTask(Profile* profile,
                        const std::string& task_id,
                        const std::set<std::string>& suffixes,
                        const std::set<std::string>& mime_types);
 
 // Returns the task ID of the default task for the given |mime_type|/|suffix|
 // combination. If it finds a MIME type match, then it prefers that over a
 // suffix match. If it a default can't be found, then it returns the empty
@@ skipping 99 matching lines @@
 
   Profile* profile_;
   const GURL source_url_;
   const std::string file_browser_id_;
   const std::string extension_id_;
 };
 
 }  // namespace file_handler_util
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_FILE_HANDLER_UTIL_H_