Add drive::FileSystem::GetFileByPathForSaving().

chrome/browser/chromeos/drive/file_system.h

Index: chrome/browser/chromeos/drive/file_system.h
diff --git a/chrome/browser/chromeos/drive/file_system.h b/chrome/browser/chromeos/drive/file_system.h
index ebead4344a415bfa5fbdc5b807d591cbb417cc7d..e42ddb9e6f978c9255df145c7a7930e9842da280 100644
--- a/chrome/browser/chromeos/drive/file_system.h
+++ b/chrome/browser/chromeos/drive/file_system.h
@@ -40,6 +40,7 @@ namespace internal {
 class ChangeListLoader;
 class ResourceMetadata;
 class SyncClient;
+class FileWriteWatcher;
 }  // namespace internal
 
 namespace file_system {
@@ -47,6 +48,7 @@ class CopyOperation;
 class CreateDirectoryOperation;
 class CreateFileOperation;
 class DownloadOperation;
+class GetFileForSavingOperation;
 class MoveOperation;
 class OpenFileOperation;
 class OperationObserver;
@@ -123,6 +125,8 @@ class FileSystem : public FileSystemInterface,
                      const FileOperationCallback& callback) OVERRIDE;
   virtual void GetFileByPath(const base::FilePath& file_path,
                              const GetFileCallback& callback) OVERRIDE;
+  virtual void GetFileByPathForSaving(const base::FilePath& file_path,
+                                      const GetFileCallback& callback) OVERRIDE;
   virtual void GetFileContentByPath(
       const base::FilePath& file_path,
       const GetFileContentInitializedCallback& initialized_callback,
@@ -300,6 +304,7 @@ class FileSystem : public FileSystemInterface,
   scoped_ptr<PrefChangeRegistrar> pref_registrar_;
 
   scoped_ptr<internal::SyncClient> sync_client_;
+  scoped_ptr<internal::FileWriteWatcher> file_write_watcher_;
 
   // The loader is used to load the change lists.
   scoped_ptr<internal::ChangeListLoader> change_list_loader_;
@@ -322,6 +327,8 @@ class FileSystem : public FileSystemInterface,
   scoped_ptr<file_system::DownloadOperation> download_operation_;
   scoped_ptr<file_system::UpdateOperation> update_operation_;
   scoped_ptr<file_system::SearchOperation> search_operation_;
+  scoped_ptr<file_system::GetFileForSavingOperation>
+      get_file_for_saving_operation_;
 
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate the weak pointers before any other members are destroyed.