google_apis: Implement DownloadFile in FakeDriveService

chrome/browser/google_apis/test_util.h

Index: chrome/browser/google_apis/test_util.h
diff --git a/chrome/browser/google_apis/test_util.h b/chrome/browser/google_apis/test_util.h
index 9d2ed93272ec2fe5c858c067c646ede9f05defb1..9fc9e0dfe4267896766b97e96ea987699994b1d8 100644
--- a/chrome/browser/google_apis/test_util.h
+++ b/chrome/browser/google_apis/test_util.h
@@ -81,6 +81,13 @@ void CopyResultsFromGetAccountMetadataCallback(
     GDataErrorCode error_in,
     scoped_ptr<AccountMetadataFeed> account_metadata_in);
 
+// Copies the results from DownloadActionCallback.
+void CopyResultsFromDownloadActionCallback(
+    GDataErrorCode* error_out,
+    FilePath* temp_file_out,
+    GDataErrorCode error_in,
+    const FilePath& temp_file_in);
+
 // Returns a HttpResponse created from the given file path.
 scoped_ptr<test_server::HttpResponse> CreateHttpResponseFromFile(
     const FilePath& file_path);