Delay autofill commits to reduce client to server traffic.

chrome/browser/sync/internal_api/sync_manager.h

Index: chrome/browser/sync/internal_api/sync_manager.h
diff --git a/chrome/browser/sync/internal_api/sync_manager.h b/chrome/browser/sync/internal_api/sync_manager.h
index eaf5ccb1fe89b0b6f9c2e5a5f8125512dffe2368..5a9b2efb7849108fd501c8e01814852703c31c38 100644
--- a/chrome/browser/sync/internal_api/sync_manager.h
+++ b/chrome/browser/sync/internal_api/sync_manager.h
@@ -10,6 +10,7 @@
 
 #include "base/basictypes.h"
 #include "base/callback.h"
+#include "base/time.h"
 #include "base/threading/thread_checker.h"
 #include "chrome/browser/sync/internal_api/change_record.h"
 #include "chrome/browser/sync/internal_api/configure_reason.h"
@@ -56,6 +57,21 @@ enum PassphraseRequiredReason {
                                        // was unsuccessful.
 };
 
+// Possible types of nudge delay for datatypes.
+// Note: These are just hints. If a sync happens then all dirty entries
+// would be committed as part of the sync.
+enum NudgeDelayType {
+  // Sync right away.
+  IMMEDIATE,
+
+  // Sync this change while syncing another change.
+  PIGGY_BACK_WITH_ANOTHER_CHANGE,
+
+  // The datatype does not use one of the predefined wait times but defines its
+  // own wait time logic for nudge.
+  CUSTOM,
+};
+
 // Contains everything needed to talk to and identify a user account.
 struct SyncCredentials {
   std::string email;
@@ -583,7 +599,16 @@ class SyncManager {
   void TriggerOnIncomingNotificationForTest(
       const syncable::ModelTypeBitSet& model_types);
 
+  static const int kDefaultNudgeDelayMilliseconds;
+  static const int kPreferencesNudgeDelayMilliseconds;
+  static const int kPiggybackNudgeDelay;
+
  private:
+  FRIEND_TEST_ALL_PREFIXES(SyncManagerTest, NudgeDelayTest);
+
+  // For unit tests.
+  base::TimeDelta GetNudgeDelayTimeDelta(const syncable::ModelType& model_type);
+
   base::ThreadChecker thread_checker_;
 
   // An opaque pointer to the nested private class.