[Sync] Split encryption state and logic out of PSS and SBHI.

components/sync/driver/sync_service.h

 // Copyright 2015 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 COMPONENTS_SYNC_DRIVER_SYNC_SERVICE_H_
 #define COMPONENTS_SYNC_DRIVER_SYNC_SERVICE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 20 matching lines @@
 class DataTypeController;
 class JsController;
 class LocalDeviceInfoProvider;
 class ProtocolEventObserver;
 class SyncClient;
 class SyncCycleSnapshot;
 class TypeDebugInfoObserver;
 struct SyncStatus;
 struct UserShare;
 
+// Events in ClearServerData flow to be recorded in histogram. Existing
+// constants should not be deleted or reordered. New ones shold be added at the
+// end, before CLEAR_SERVER_DATA_MAX.
+enum ClearServerDataEvents {
+  // ClearServerData started after user switched to custom passphrase.
+  CLEAR_SERVER_DATA_STARTED,
+  // DataTypeManager reported that catchup configuration failed.
+  CLEAR_SERVER_DATA_CATCHUP_FAILED,
+  // ClearServerData flow restarted after browser restart.
+  CLEAR_SERVER_DATA_RETRIED,
+  // Success.
+  CLEAR_SERVER_DATA_SUCCEEDED,
+  // Client received RECET_LOCAL_SYNC_DATA after custom passphrase was enabled
+  // on different client.
+  CLEAR_SERVER_DATA_RESET_LOCAL_DATA_RECEIVED,
+  CLEAR_SERVER_DATA_MAX
+};
+
 // UIs that need to prevent Sync startup should hold an instance of this class
 // until the user has finished modifying sync settings. This is not an inner
 // class of SyncService to enable forward declarations.
 class SyncSetupInProgressHandle {
  public:
   // UIs should not construct this directly, but instead call
   // SyncService::GetSetupInProgress().
   explicit SyncSetupInProgressHandle(base::Closure on_destroy);
 
   ~SyncSetupInProgressHandle();
@@ skipping 281 matching lines @@
  protected:
   SyncService() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SyncService);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_DRIVER_SYNC_SERVICE_H_