Create a cache file before mounting zip file.

chrome/browser/chromeos/extensions/file_manager/private_api_mount.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.
 //
 // This file provides task related API functions.
 
 #ifndef CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_MOUNT_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_MOUNT_H_
 
 #include <vector>
 
 #include "base/files/file_path.h"
+#include "chrome/browser/chromeos/drive/drive.pb.h"
 #include "chrome/browser/chromeos/drive/file_errors.h"
 #include "chrome/browser/chromeos/extensions/file_manager/private_api_base.h"
 
 namespace ui {
 struct SelectedFileInfo;
 }
 
 namespace extensions {
 
 // Implements chrome.fileManagerPrivate.addMount method.
 // Mounts removable devices and archive files.
 class FileManagerPrivateAddMountFunction : public LoggedAsyncExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("fileManagerPrivate.addMount",
                              FILEMANAGERPRIVATE_ADDMOUNT)
 
  protected:
   virtual ~FileManagerPrivateAddMountFunction() {}
 
   // AsyncExtensionFunction overrides.
   virtual bool RunAsync() OVERRIDE;
 
  private:
+  // Part of Run(). Called after GetFile for Drive File System.
+  void RunAfterGetDriveFile(const base::FilePath& drive_path,
+                            drive::FileError error,
+                            const base::FilePath& cache_path,
+                            scoped_ptr<drive::ResourceEntry> entry);
+
   // Part of Run(). Called after MarkCacheFielAsMounted for Drive File System.
   // (or directly called from RunAsync() for other file system).
   void RunAfterMarkCacheFileAsMounted(const base::FilePath& display_name,
                                       drive::FileError error,
                                       const base::FilePath& file_path);
 };
 
 // Implements chrome.fileManagerPrivate.removeMount method.
 // Unmounts selected volume. Expects volume id as an argument.
 class FileManagerPrivateRemoveMountFunction
@@ skipping 19 matching lines @@
  protected:
   virtual ~FileManagerPrivateGetVolumeMetadataListFunction() {}
 
   // AsyncExtensionFunction overrides.
   virtual bool RunAsync() OVERRIDE;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_MOUNT_H_