sync: Loop committing items without downloading updates

sync/sessions/session_state.h

Index: sync/sessions/session_state.h
diff --git a/sync/sessions/session_state.h b/sync/sessions/session_state.h
index 7403758b728e0a83a63c87ec30dec3590bb1cb7f..27872c5207dd618a9f29ce27fe5cd097888da6a8 100644
--- a/sync/sessions/session_state.h
+++ b/sync/sessions/session_state.h
@@ -23,7 +23,6 @@
 #include "sync/engine/syncer_types.h"
 #include "sync/engine/syncproto.h"
 #include "sync/protocol/sync_protocol_error.h"
-#include "sync/sessions/ordered_commit_set.h"
 #include "sync/syncable/model_type.h"
 #include "sync/syncable/model_type_payload_map.h"
 #include "sync/syncable/syncable.h"
@@ -115,12 +114,10 @@ struct SyncSessionSnapshot {
           (&download_progress_markers)[syncable::MODEL_TYPE_COUNT],
       bool more_to_sync,
       bool is_silenced,
-      int64 unsynced_count,
       int num_encryption_conflicts,
       int num_hierarchy_conflicts,
       int num_simple_conflicts,
       int num_server_conflicts,
-      bool did_commit_items,
       const SyncSourceInfo& source,
       bool notifications_enabled,
       size_t num_entries,
@@ -141,12 +138,10 @@ struct SyncSessionSnapshot {
   const std::string download_progress_markers[syncable::MODEL_TYPE_COUNT];
   const bool has_more_to_sync;
   const bool is_silenced;
-  const int64 unsynced_count;
   const int num_encryption_conflicts;
   const int num_hierarchy_conflicts;
   const int num_simple_conflicts;
   const int num_server_conflicts;
-  const bool did_commit_items;
   const SyncSourceInfo source;
   const bool notifications_enabled;
   const size_t num_entries;
@@ -301,20 +296,15 @@ struct AllModelTypeState {
   explicit AllModelTypeState(bool* dirty_flag);
   ~AllModelTypeState();
 
-  // Commits for all model types are bundled together into a single message.
-  ClientToServerMessage commit_message;
-  ClientToServerResponse commit_response;
   // We GetUpdates for some combination of types at once.
   // requested_update_types stores the set of types which were requested.
   syncable::ModelTypeSet updates_request_types;
   ClientToServerResponse updates_response;
   // Used to build the shared commit message.
-  DirtyOnWrite<std::vector<int64> > unsynced_handles;
   DirtyOnWrite<SyncerStatus> syncer_status;
   DirtyOnWrite<ErrorCounters> error;
   SyncCycleControlParameters control_params;
   DirtyOnWrite<int64> num_server_changes_remaining;
-  OrderedCommitSet commit_set;
 };
 
 // Grouping of all state that applies to a single ModelSafeGroup.