gdata: Add requestDirectoryRefresh to file_browser_private.

chrome/browser/chromeos/gdata/gdata_file_system_unittest.cc

Index: chrome/browser/chromeos/gdata/gdata_file_system_unittest.cc
diff --git a/chrome/browser/chromeos/gdata/gdata_file_system_unittest.cc b/chrome/browser/chromeos/gdata/gdata_file_system_unittest.cc
index 55afd6e9964fb8e82221bfa16a54099911776037..ab051c20d8131eaa72ba0514d343bc224d6d13a2 100644
--- a/chrome/browser/chromeos/gdata/gdata_file_system_unittest.cc
+++ b/chrome/browser/chromeos/gdata/gdata_file_system_unittest.cc
@@ -3663,4 +3663,17 @@ TEST_F(GDataFileSystemTest, MountUnmount) {
   EXPECT_EQ(1, num_callback_invocations_);
 }
 
+TEST_F(GDataFileSystemTest, RequestDirectoryRefresh) {
+  // We'll fetch documents in the root directory with its resource ID.
+  EXPECT_CALL(*mock_doc_service_,
+              GetDocuments(Eq(GURL()), _, _, kGDataRootDirectoryResourceId, _))
+      .Times(1);
+  // We'll notify the directory change to the observer.
+  EXPECT_CALL(*mock_directory_observer_,
+              OnDirectoryChanged(Eq(FilePath(kGDataRootDirectory)))).Times(1);
+
+  file_system_->RequestDirectoryRefresh(FilePath(kGDataRootDirectory));
+  message_loop_.RunAllPending();
+}
+
 }   // namespace gdata