[SyncFS] Add RemoteToLocalSyncer skeleton

chrome/browser/sync_file_system/drive_backend/sync_engine_context.h

Index: chrome/browser/sync_file_system/drive_backend/sync_engine_context.h
diff --git a/chrome/browser/sync_file_system/drive_backend/sync_engine_context.h b/chrome/browser/sync_file_system/drive_backend/sync_engine_context.h
index f56f2a209b9169555582464f57d66b4fe5d720d7..5220f36ed2ec00ff0c41548bc956f6b7b791d110 100644
--- a/chrome/browser/sync_file_system/drive_backend/sync_engine_context.h
+++ b/chrome/browser/sync_file_system/drive_backend/sync_engine_context.h
@@ -12,6 +12,9 @@ class DriveServiceInterface;
 }
 
 namespace sync_file_system {
+
+class RemoteChangeProcessor;
+
 namespace drive_backend {
 
 class MetadataDatabase;
@@ -23,6 +26,7 @@ class SyncEngineContext {
 
   virtual drive::DriveServiceInterface* GetDriveService() = 0;
   virtual MetadataDatabase* GetMetadataDatabase() = 0;
+  virtual RemoteChangeProcessor* GetRemoteChangeProcessor() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SyncEngineContext);