sync: raise initial backoff interval from 1 second to 5 minutes.

sync/internal_api/public/engine/polling_constants.cc

Index: sync/internal_api/public/engine/polling_constants.cc
diff --git a/sync/internal_api/public/engine/polling_constants.cc b/sync/internal_api/public/engine/polling_constants.cc
index d65994bdc7b62720b56295d65b4915b2dd3ca65e..fe15be93a3781f535717f200f53e3729afcff3c5 100644
--- a/sync/internal_api/public/engine/polling_constants.cc
+++ b/sync/internal_api/public/engine/polling_constants.cc
@@ -22,5 +22,13 @@ const int64 kMaxBackoffSeconds = 60 * 60 * 4;  // 4 hours.
 // Backoff interval randomization factor.
 const int kBackoffRandomizationFactor = 2;
 
-}  // namespace syncer
+// After a failure contacting sync servers, specifies how long to wait before
+// reattempting and entering exponential backoff if consecutive failures
+// occur.
+const int kInitialBackoffRetrySeconds = 60 * 5;  // 5 minutes.
+
+// Similar to kInitialBackoffRetrySeconds above, but only to be used in
+// certain exceptional error cases, such as MIGRATION_DONE.
+const int kInitialBackoffImmediateRetrySeconds = 1;

[rlarocque, 2012/08/11 00:22:56]

The word "Immediate" is misleading here.  Maybe
s/BackoffImmediate/ShortBackoff/?

[tim (not reviewing), 2012/08/11 00:43:58]

Ok.  I had QuickBackoff initially, but I thought it sounded too approachable and
wanted something that drove home the fact that you probably dont want this.  I
even toyed with kInitialBackoffDangerouslyQuickRetry :)  I guess I'll just go
with 'Short'.

 
+}  // namespace syncer