Set root resource ID upon full feed update.

chrome/browser/chromeos/drive/drive_resource_metadata.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_DRIVE_DRIVE_RESOURCE_METADATA_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_RESOURCE_METADATA_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 41 matching lines @@
   // Content is initialized from disk cache.
   FROM_CACHE,
   // Content is initialized from the direct server response.
   FROM_SERVER,
 };
 
 // The root directory name used for the Google Drive file system tree. The
 // name is used in URLs for the file manager, hence user-visible.
 const FilePath::CharType kDriveRootDirectory[] = FILE_PATH_LITERAL("drive");
 
-// The resource ID for the root directory is defined in the spec:
+// The resource ID for the root directory for WAPI is defined in the spec:
 // https://developers.google.com/google-apps/documents-list/
-const char kDriveRootDirectoryResourceId[] = "folder:root";
+// Note that this special ID only applies to WAPI. Drive uses a non-constant
+// unique ID given in About resource.
+const char kWAPIRootDirectoryResourceId[] = "folder:root";
 
 // This should be incremented when incompatibility change is made in
 // drive.proto.
 const int32 kProtoVersion = 2;
 
 // Used for file operations like removing files.
 typedef base::Callback<void(DriveFileError error)>
     FileOperationCallback;
 
 // Callback similar to FileOperationCallback but with a given |file_path|.
@@ skipping 180 matching lines @@
   void SerializeToString(std::string* serialized_proto) const;
   bool ParseFromString(const std::string& serialized_proto);
 
   // Restores from and saves to database, calling |callback| asynchronously.
   // |callback| must not be null.
   void InitFromDB(const FilePath& db_path,
                   base::SequencedTaskRunner* blocking_task_runner,
                   const FileOperationCallback& callback);
   void SaveToDB();
 
+  // Returns the resource ID of the root directory or empty string if it is
+  // not initialized.
+  const std::string root_resource_id() const;

[satorux1, 2012/10/23 08:06:26]

Drop the first const.

Besides, this seems to be only used for testing. If so, please rename this to
GetRootResourceIdForTesting()

[kochi, 2012/10/23 08:21:21]

Done.
No, this is used for
http://codereview.chromium.org/11230025/

+
  private:
   // Initializes the resource map using serialized_resources fetched from the
   // database.
   // |callback| must not be null.
   void InitResourceMap(CreateDBParams* create_params,
                        const FileOperationCallback& callback);
 
   // Clears root_ and the resource map.
   void ClearRoot();
 
@@ skipping 40 matching lines @@
   // This should remain the last member so it'll be destroyed first and
   // invalidate its weak pointers before other members are destroyed.
   base::WeakPtrFactory<DriveResourceMetadata> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DriveResourceMetadata);
 };
 
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_RESOURCE_METADATA_H_