[Sync] Convert SyncSessionSnapshot to a copy-able class.

sync/internal_api/js_sync_manager_observer_unittest.cc

 // 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.
 
 #include "sync/internal_api/js_sync_manager_observer.h"
 
 #include "base/basictypes.h"
 #include "base/location.h"
 #include "base/message_loop.h"
 #include "base/values.h"
@@ skipping 54 matching lines @@
   js_sync_manager_observer_.OnInitializationComplete(WeakHandle<JsBackend>(),
       true);
   js_sync_manager_observer_.OnStopSyncingPermanently();
   js_sync_manager_observer_.OnClearServerDataSucceeded();
   js_sync_manager_observer_.OnClearServerDataFailed();
   js_sync_manager_observer_.OnEncryptionComplete();
   PumpLoop();
 }
 
 TEST_F(JsSyncManagerObserverTest, OnSyncCycleCompleted) {
-  std::string download_progress_markers[syncable::MODEL_TYPE_COUNT];
+  syncable::ModelTypePayloadMap download_progress_markers;
   sessions::SyncSessionSnapshot snapshot(sessions::SyncerStatus(),
                                          sessions::ErrorCounters(),
                                          100,
                                          false,
                                          syncable::ModelTypeSet(),
                                          download_progress_markers,
                                          false,
                                          true,
                                          100,
                                          8,
                                          5,
                                          2,
                                          7,
                                          false,
                                          sessions::SyncSourceInfo(),
                                          false,
                                          0,
                                          base::Time::Now(),
                                          false);
   DictionaryValue expected_details;
   expected_details.Set("snapshot", snapshot.ToValue());
 
   EXPECT_CALL(mock_js_event_handler_,
               HandleJsEvent("onSyncCycleCompleted",
                            HasDetailsAsDictionary(expected_details)));
 
-  js_sync_manager_observer_.OnSyncCycleCompleted(&snapshot);
+  js_sync_manager_observer_.OnSyncCycleCompleted(snapshot);
   PumpLoop();
 }
 
 TEST_F(JsSyncManagerObserverTest, OnActionableError) {
   browser_sync::SyncProtocolError sync_error;
   sync_error.action = browser_sync::CLEAR_USER_DATA_AND_RESYNC;
   sync_error.error_type = browser_sync::TRANSIENT_ERROR;
   DictionaryValue expected_details;
   expected_details.Set("syncError", sync_error.ToValue());
 
@@ skipping 99 matching lines @@
               HandleJsEvent("onEncryptedTypesChanged",
                             HasDetailsAsDictionary(expected_details)));
 
   js_sync_manager_observer_.OnEncryptedTypesChanged(
       encrypted_types, encrypt_everything);
   PumpLoop();
 }
 
 }  // namespace
 }  // namespace browser_sync