[SyncFS] Add per-URL promote of demoted changes in LocalFileChangeTracker

chrome/browser/sync_file_system/local/local_file_change_tracker_unittest.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/sync_file_system/local/local_file_change_tracker.h"
 
 #include <deque>
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 101 matching lines @@
   base::MessageLoopForIO message_loop_;
   scoped_ptr<leveldb::Env> in_memory_env_;
   CannedSyncableFileSystem file_system_;
 
  private:
   scoped_refptr<LocalFileSyncContext> sync_context_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalFileChangeTrackerTest);
 };
 
+TEST_F(LocalFileChangeTrackerTest, DemoteAndPromote) {
+  EXPECT_EQ(base::File::FILE_OK, file_system_.OpenFileSystem());
+
+  const char kPath[] = "foo/bar";
+  change_tracker()->OnCreateDirectory(URL(kPath));
+
+  FileSystemURLSet urls;
+  file_system_.GetChangedURLsInTracker(&urls);
+  ASSERT_EQ(1u, urls.size());
+  EXPECT_EQ(URL(kPath), *urls.begin());
+
+  change_tracker()->DemoteChangesForURL(URL(kPath));
+
+  file_system_.GetChangedURLsInTracker(&urls);
+  ASSERT_TRUE(urls.empty());
+
+  change_tracker()->PromoteDemotedChangesForURL(URL(kPath));
+
+  file_system_.GetChangedURLsInTracker(&urls);
+  ASSERT_EQ(1u, urls.size());
+  EXPECT_EQ(URL(kPath), *urls.begin());
+
+  change_tracker()->DemoteChangesForURL(URL(kPath));
+  change_tracker()->OnRemoveDirectory(URL(kPath));
+
+  file_system_.GetChangedURLsInTracker(&urls);
+  ASSERT_TRUE(urls.empty());
+}
+
 TEST_F(LocalFileChangeTrackerTest, GetChanges) {
   EXPECT_EQ(base::File::FILE_OK, file_system_.OpenFileSystem());
 
   // Test URLs (no parent/child relationships, as we test such cases
   // mainly in LocalFileSyncStatusTest).
   const char kPath0[] = "test/dir a/dir";
   const char kPath1[] = "test/dir b";
   const char kPath2[] = "test/foo.txt";
   const char kPath3[] = "test/bar";
   const char kPath4[] = "temporary/dir a";
@@ skipping 544 matching lines @@
 
   // Make sure they're gone from the database too.
   DropChangesInTracker();
   RestoreChangesFromTrackerDB();
 
   GetAllChangedURLs(&urls);
   EXPECT_TRUE(urls.empty());
 }
 
 }  // namespace sync_file_system