[SyncFS] Add RemoteToLocalSyncer skeleton

chrome/browser/sync_file_system/drive_backend/remote_to_local_syncer.h

Index: chrome/browser/sync_file_system/drive_backend/remote_to_local_syncer.h
diff --git a/chrome/browser/sync_file_system/drive_backend/remote_to_local_syncer.h b/chrome/browser/sync_file_system/drive_backend/remote_to_local_syncer.h
index 56c65c4036d6850ac1a8a8340d100f3b43b1a0d4..519feef19b89a9fd0ebdb027e74b69fe525fb185 100644
--- a/chrome/browser/sync_file_system/drive_backend/remote_to_local_syncer.h
+++ b/chrome/browser/sync_file_system/drive_backend/remote_to_local_syncer.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_REMOTE_TO_LOCAL_SYNCER_H_
 
 #include "base/memory/weak_ptr.h"
+#include "chrome/browser/sync_file_system/drive_backend/metadata_database.pb.h"
 #include "chrome/browser/sync_file_system/remote_change_processor.h"
 #include "chrome/browser/sync_file_system/sync_callbacks.h"
 #include "chrome/browser/sync_file_system/sync_task.h"
@@ -14,6 +15,10 @@ namespace drive {
 class DriveServiceInterface;
 }
 
+namespace drive {
+class DriveServiceInterface;
+}
+
 namespace sync_file_system {
 namespace drive_backend {
 
@@ -22,17 +27,64 @@ class SyncEngineContext;
 
 class RemoteToLocalSyncer : public SyncTask {
  public:
-  explicit RemoteToLocalSyncer(SyncEngineContext* sync_context);
+  enum Priority {
+    PRIORITY_NORMAL = 1 << 0,
+    PRIORITY_LOW = 1 << 1,
+  };
+
+  // |priorities| must be a bitwise-or'd value of Priority.
+  // Conflicting trackers will have low priority for RemoteToLocalSyncer so that
+  // it should be resolved by LocatToRemoteSyncer.
+  RemoteToLocalSyncer(SyncEngineContext* sync_context,
+                      int priorities);
   virtual ~RemoteToLocalSyncer();
   virtual void Run(const SyncStatusCallback& callback) OVERRIDE;
 
  private:
+  void AnalyzeCurrentDirtyTracker();
+
+  void ResolveRemoteChange(const SyncStatusCallback& callback);
+
+  void GetRemoteResource(const SyncStatusCallback& callback);
+
+  void HandleDeletion(const SyncStatusCallback& callback);
+  void HandleNewFile(const SyncStatusCallback& callback);
+  void HandleContentUpdate(const SyncStatusCallback& callback);
+  void ListFolderContent(const SyncStatusCallback& callback);
+  void HandleRename(const SyncStatusCallback& callback);
+  void HandleReorganize(const SyncStatusCallback& callback);
+  void HandleOfflineSolvable(const SyncStatusCallback& callback);
+
+  void SyncCompleted(const SyncStatusCallback& callback);
+
+  void Prepare(const SyncStatusCallback& callback);
+  void DidPrepare(const SyncStatusCallback& callback,
+                  SyncStatusCode status,
+                  const SyncFileMetadata& metadata,
+                  const FileChangeList& changes);
+
   drive::DriveServiceInterface* drive_service();
   MetadataDatabase* metadata_database();
   RemoteChangeProcessor* remote_change_processor();
 
   SyncEngineContext* sync_context_;  // Not owned.
 
+  int priorities_;
+  FileTracker dirty_tracker_;
+  FileTracker parent_tracker_;
+  FileMetadata remote_metadata_;
+
+  bool missing_remote_details_;
+  bool missing_synced_details_;
+  bool deleted_remote_details_;
+  bool deleted_synced_details_;
+  bool title_changed_;
+  bool content_changed_;
+  bool needs_folder_listing_;
+  bool missing_parent_;
+
+  bool sync_root_modification_;
+
   base::WeakPtrFactory<RemoteToLocalSyncer> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteToLocalSyncer);