[SyncFS] Add RemoteToLocalSyncer skeleton

chrome/browser/sync_file_system/drive_backend/local_to_remote_syncer.h

Index: chrome/browser/sync_file_system/drive_backend/local_to_remote_syncer.h
diff --git a/chrome/browser/sync_file_system/drive_backend/local_to_remote_syncer.h b/chrome/browser/sync_file_system/drive_backend/local_to_remote_syncer.h
index cb16ee522e5f90f2163a22df569c09c3800d4136..4a7ad74120d902a7294e86590457daa873ca9213 100644
--- a/chrome/browser/sync_file_system/drive_backend/local_to_remote_syncer.h
+++ b/chrome/browser/sync_file_system/drive_backend/local_to_remote_syncer.h
@@ -5,19 +5,26 @@
 #ifndef CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_LOCAL_TO_REMOTE_SYNCER_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_LOCAL_TO_REMOTE_SYNCER_H_
 
+#include "base/memory/weak_ptr.h"
 #include "chrome/browser/sync_file_system/sync_callbacks.h"
 #include "chrome/browser/sync_file_system/sync_task.h"
 
 namespace sync_file_system {
 namespace drive_backend {
 
+class SyncEngineContext;
+
 class LocalToRemoteSyncer : public SyncTask {
  public:
-  LocalToRemoteSyncer();
+  explicit LocalToRemoteSyncer(SyncEngineContext* sync_context);
   virtual ~LocalToRemoteSyncer();
   virtual void Run(const SyncStatusCallback& callback) OVERRIDE;
 
  private:
+  SyncEngineContext* sync_context_;  // Not owned.
+
+  base::WeakPtrFactory<LocalToRemoteSyncer> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(LocalToRemoteSyncer);
 };