Avoid useless SYNC_CYCLE_CONTINUATION sync cycle

chrome/browser/sync/sessions/sync_session.h

Index: chrome/browser/sync/sessions/sync_session.h
diff --git a/chrome/browser/sync/sessions/sync_session.h b/chrome/browser/sync/sessions/sync_session.h
index abed10eac7fee2729f73822592e96fcf2acd02f9..8f9148f97abe885e5327c8dcbc6e490fce933319 100644
--- a/chrome/browser/sync/sessions/sync_session.h
+++ b/chrome/browser/sync/sessions/sync_session.h
@@ -112,6 +112,22 @@ class SyncSession {
   // engine again.
   bool HasMoreToSync() const;
 
+  // Returns true if this session experienced an error that could possibly go
+  // away on its own.  This suggests a good course of action would be to try
+  // again later.
+  //
+  // Returns false if the session has not been used in a call to SyncShare, or
+  // if no error was detected, or if at all recorded errors were non-transient.
+  bool ExperiencedTransientError() const;
+
+  // Returns true if this session completed without experiencing any sort of
+  // errors.
+  //
+  // Returns false if SyncShare has not been called on this session yet, or
+  // if ResetTransientState() has been called on this session since the last
+  // call to SyncShare.
+  bool Succeeded() const;
+
   // Collects all state pertaining to how and why |s| originated and unions it
   // with corresponding state in |this|, leaving |s| unchanged.  Allows |this|
   // to take on the responsibilities |s| had (e.g. certain data types) in the