Set root resource ID upon full feed update.

chrome/browser/chromeos/drive/drive_resource_metadata.h

Index: chrome/browser/chromeos/drive/drive_resource_metadata.h
diff --git a/chrome/browser/chromeos/drive/drive_resource_metadata.h b/chrome/browser/chromeos/drive/drive_resource_metadata.h
index 195da00228ce673f454d85fb6c67824d93ac4f9e..6bb87f40570f76f4d747e309fe6b7cde29865a31 100644
--- a/chrome/browser/chromeos/drive/drive_resource_metadata.h
+++ b/chrome/browser/chromeos/drive/drive_resource_metadata.h
@@ -59,9 +59,11 @@ enum ContentOrigin {
 // 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.
@@ -262,6 +264,10 @@ class DriveResourceMetadata {
                   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.