Implement chrome.fileSystem.requestFileSystem().

chrome/browser/extensions/api/file_system/file_system_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_FILE_SYSTEM_FILE_SYSTEM_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_FILE_SYSTEM_FILE_SYSTEM_API_H_
 
 #include <string>
 #include <vector>
 
 #include "base/files/file.h"
 #include "base/files/file_path.h"
+#include "base/memory/ref_counted.h"

[hirono, 2015/03/19 03:33:54]

nit: Is this ref_counted used?

[mtomasz, 2015/03/19 10:28:41]

Not at all. Done.

 #include "chrome/browser/extensions/chrome_extension_function.h"
+#include "chrome/browser/extensions/chrome_extension_function_details.h"
 #include "chrome/common/extensions/api/file_system.h"
+#include "extensions/browser/extension_function.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
 
+namespace storage {
+class FileSystemContext;
+}  // namespace storage
+
 namespace extensions {
 class ExtensionPrefs;
 
 namespace file_system_api {
 
 // Methods to get and set the path of the directory containing the last file
 // chosen by the user in response to a chrome.fileSystem.chooseEntry() call for
 // the given extension.
 
 // Returns an empty path on failure.
@@ skipping 206 matching lines @@
     : public ChromeSyncExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("fileSystem.getObservedEntries",
                              FILESYSTEM_GETOBSERVEDENTRIES);
 
  protected:
   ~FileSystemGetObservedEntriesFunction() override {}
   bool RunSync() override;
 };
 
+// Requests a file system for the specified volume id.
+class FileSystemRequestFileSystemFunction : public UIThreadExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("fileSystem.requestFileSystem",
+                             FILESYSTEM_REQUESTFILESYSTEM)
+  FileSystemRequestFileSystemFunction();
+
+ protected:
+  ~FileSystemRequestFileSystemFunction() override {}
+
+  // AsyncExtensionFunction overrides.
+  ExtensionFunction::ResponseAction Run() override;
+
+ private:
+  ChromeExtensionFunctionDetails chrome_details_;
+
+#if defined(OS_CHROMEOS)
+  // Requests user consent for accessing the volume identified by |name|.
+  void RequestConsent(const std::string& display_name,
+                      bool writable,
+                      const base::Callback<void(bool)>& callback);
+  // Called when a user grants or rejects permissions for the file system
+  // access.
+  void OnConsentReceived(const std::string& volume_id,
+                         bool writable,
+                         bool granted);
+#endif
+};
+
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_FILE_SYSTEM_FILE_SYSTEM_API_H_