gdata: Fix "save as pdf" to work on Google Drive.

chrome/browser/chromeos/gdata/gdata_file_system.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_GDATA_GDATA_FILE_SYSTEM_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILE_SYSTEM_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 56 matching lines @@
       const FilePath& local_dest_file_path,
       const FileOperationCallback& callback) OVERRIDE;
   virtual void TransferFileFromLocalToRemote(
       const FilePath& local_src_file_path,
       const FilePath& remote_dest_file_path,
       const FileOperationCallback& callback) OVERRIDE;
   virtual void OpenFile(const FilePath& file_path,
                         const OpenFileCallback& callback) OVERRIDE;
   virtual void CloseFile(const FilePath& file_path,
                          const FileOperationCallback& callback) OVERRIDE;
+  virtual void PrepareWritableFileAndRun(
+      const FilePath& file_path,
+      const OpenFileCallback& callback) OVERRIDE;
   virtual void Copy(const FilePath& src_file_path,
                     const FilePath& dest_file_path,
                     const FileOperationCallback& callback) OVERRIDE;
   virtual void Move(const FilePath& src_file_path,
                     const FilePath& dest_file_path,
                     const FileOperationCallback& callback) OVERRIDE;
   virtual void Remove(const FilePath& file_path,
                       bool is_recursive,
                       const FileOperationCallback& callback) OVERRIDE;
   virtual void CreateDirectory(const FilePath& directory_path,
@@ skipping 761 matching lines @@
     GDataFileError error,
     scoped_ptr<GDataEntryProto> entry_proto);
 
   // Part of RequestDirectoryRefreshOnUIThread(). Called after
   // GetEntryInfoByPath() is complete.
   void RequestDirectoryRefreshOnUIThreadAfterGetEntryInfo(
     const FilePath& file_path,
     GDataFileError error,
     scoped_ptr<GDataEntryProto> entry_proto);
 
+  // Part of PrepareWritableFilePathAndRun(). It forwards the task to the UI
+  // thread, tries CreateFile for the case file does not exist yet, does
+  // OpenFile to download and mark the file as dirty, runs |callback|, and
+  // finally calls CloseFile.
+  void PrepareWritableFileAndRunOnUIThread(
+      const FilePath& file_path,
+      const OpenFileCallback& callback);
+  void PrepareWritableFileAndRunAfterCreateFile(
+      const FilePath& file_path,
+      const OpenFileCallback& callback,
+      GDataFileError result);
+  void PrepareWritableFileAndRunAfterOpenFile(
+      const FilePath& file_path,
+      const OpenFileCallback& callback,
+      GDataFileError result,
+      const FilePath& local_cache_path);
+  void PrepareWritableFileAndRunAfterCallback(const FilePath& file_path);
+
   // All members should be accessed only on UI thread. Do not post tasks to
   // other threads with base::Unretained(this).
   scoped_ptr<GDataDirectoryService> directory_service_;
 
   // The profile hosts the GDataFileSystem via GDataSystemService.
   Profile* profile_;
 
   // The cache owned by GDataSystemService.
   GDataCache* cache_;
 
@@ skipping 22 matching lines @@
   base::WeakPtr<GDataFileSystem> ui_weak_ptr_;
 
   ObserverList<Observer> observers_;
 
   scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
 };
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILE_SYSTEM_H_