sync: Buffer Protocol Events for about:sync page

sync/internal_api/public/sync_manager.h

Index: sync/internal_api/public/sync_manager.h
diff --git a/sync/internal_api/public/sync_manager.h b/sync/internal_api/public/sync_manager.h
index 38bad0786d4983dfaaac7e23c680782c7d482183..db1e188119222f229511d3731409906bd3495368 100644
--- a/sync/internal_api/public/sync_manager.h
+++ b/sync/internal_api/public/sync_manager.h
@@ -12,6 +12,7 @@
 #include "base/callback_forward.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/scoped_vector.h"
 #include "base/task_runner.h"
 #include "base/threading/thread_checker.h"
 #include "sync/base/sync_export.h"
@@ -353,6 +354,9 @@ class SYNC_EXPORT SyncManager : public syncer::InvalidationHandler {
 
   // Ask the SyncManager to fetch updates for the given types.
   virtual void RefreshTypes(ModelTypeSet types) = 0;
+
+  // Returns any buffered protocol events.  Does not clear the buffer.
+  virtual ScopedVector<syncer::ProtocolEvent> GetBufferedProtocolEvents() = 0;
 };
 
 }  // namespace syncer