[Sync] - Implement isolated model association.

chrome/browser/sync/glue/data_type_manager.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_SYNC_GLUE_DATA_TYPE_MANAGER_H__
 #define CHROME_BROWSER_SYNC_GLUE_DATA_TYPE_MANAGER_H__
 #pragma once
 
 #include <list>
 #include <set>
@@ skipping 41 matching lines @@
 
   typedef syncable::ModelTypeSet TypeSet;
 
   // Note: |errors| is only filled when status is not OK.
   struct ConfigureResult {
     ConfigureResult();
     ConfigureResult(ConfigureStatus status,
                     TypeSet requested_types);
     ConfigureResult(ConfigureStatus status,
                     TypeSet requested_types,
-                    const std::list<SyncError>& errors);
+                    const std::list<SyncError>& failed_data_types,
+                    syncable::ModelTypeSet waiting_to_start);
     ~ConfigureResult();
     ConfigureStatus status;
     TypeSet requested_types;
-    std::list<SyncError> errors;
+
+    // These types encountered a failure in association.
+    std::list<SyncError> failed_data_types;
+
+    // List of types that failed to start association with in our alloted
+    // time period(see kDataTypeLoadWaitTimeInSeconds). We move
+    // forward here and allow these types to continue loading in the
+    // background. When these types are loaded DataTypeManager will
+    // be informed and another configured cycle will be started.
+    syncable::ModelTypeSet waiting_to_start;
   };
 
   virtual ~DataTypeManager() {}
 
   // Convert a ConfigureStatus to string for debug purposes.
   static std::string ConfigureStatusToString(ConfigureStatus status);
 
   // Begins asynchronous configuration of data types.  Any currently
   // running data types that are not in the desired_types set will be
   // stopped.  Any stopped data types that are in the desired_types
@@ skipping 18 matching lines @@
   // stopped.
   virtual void Stop() = 0;
 
   // The current state of the data type manager.
   virtual State state() const = 0;
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_DATA_TYPE_MANAGER_H__