Add LocalFileChangeTracker database to record non-synced dirty files

webkit/fileapi/syncable/local_file_change_tracker.h

Index: webkit/fileapi/syncable/local_file_change_tracker.h
diff --git a/webkit/fileapi/syncable/local_file_change_tracker.h b/webkit/fileapi/syncable/local_file_change_tracker.h
index 14e1bf2f2d77c8a4c76c75d80ed1cb178b7a42d8..d04c4d1bd58412cb9ea4ce0041d4fae61ab5d2ed 100644
--- a/webkit/fileapi/syncable/local_file_change_tracker.h
+++ b/webkit/fileapi/syncable/local_file_change_tracker.h
@@ -6,6 +6,7 @@
 #define WEBKIT_FILEAPI_SYNCABLE_LOCAL_FILE_CHANGE_TRACKER_H_
 
 #include <map>
+#include <string>
 #include <vector>
 
 #include "base/basictypes.h"
@@ -41,6 +42,7 @@ class FILEAPI_EXPORT LocalFileChangeTracker
   // (So that we can make sure DB operations are done before actual update
   // happens)
   LocalFileChangeTracker(LocalFileSyncStatus* sync_status,
+                         const FilePath& profile_path,
                          base::SequencedTaskRunner* file_task_runner);
   virtual ~LocalFileChangeTracker();
 
@@ -75,12 +77,19 @@ class FILEAPI_EXPORT LocalFileChangeTracker
   void CollectLastDirtyChanges(FileChangeMap* changes);
 
  private:
+  class TrackerDB;
+  friend class LocalFileChangeTrackerTest;
+
   void RecordChange(const FileSystemURL& url, const FileChange& change);
 
   // Database related methods.
   void MarkDirtyOnDatabase(const FileSystemURL& url);
   void ClearDirtyOnDatabase(const FileSystemURL& url);
 
+  std::string SerializeExternalFileSystemURL(const FileSystemURL& url);
+  bool DeserializeExternalFileSystemURL(
+      const std::string& serialized_url, FileSystemURL* url);
+
   // Not owned; this must have the same lifetime with us (both owned
   // by FileSystemContext).
   LocalFileSyncStatus *sync_status_;
@@ -89,6 +98,8 @@ class FILEAPI_EXPORT LocalFileChangeTracker
 
   FileChangeMap changes_;
 
+  scoped_ptr<TrackerDB> tracker_db_;
+
   DISALLOW_COPY_AND_ASSIGN(LocalFileChangeTracker);
 };