[sync] Componentize sync: Part 2: Add SYNC_EXPORTs to files in src/sync/

sync/internal_api/public/sessions/sync_session_snapshot.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright 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 SYNC_INTERNAL_API_PUBLIC_SESSIONS_SYNC_SESSION_SNAPSHOT_H_
 #define SYNC_INTERNAL_API_PUBLIC_SESSIONS_SYNC_SESSION_SNAPSHOT_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/time.h"
+#include "sync/base/sync_export.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/base/progress_marker_map.h"
 #include "sync/internal_api/public/sessions/model_neutral_state.h"
 #include "sync/internal_api/public/sessions/sync_source_info.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace syncer {
 namespace sessions {
 
 // An immutable snapshot of state from a SyncSession.  Convenient to use as
 // part of notifications as it is inherently thread-safe.
 // TODO(zea): if copying this all over the place starts getting expensive,
 // consider passing around immutable references instead of values.
 // Default copy and assign welcome.
-class SyncSessionSnapshot {
+class SYNC_EXPORT SyncSessionSnapshot {
  public:
   SyncSessionSnapshot();
   SyncSessionSnapshot(
       const ModelNeutralState& model_neutral_state,
       bool is_share_usable,
       ModelTypeSet initial_sync_ended,
       const ProgressMarkerMap& download_progress_markers,
       bool is_silenced,
       int num_encryption_conflicts,
       int num_hierarchy_conflicts,
@@ skipping 52 matching lines @@
   std::vector<int> num_entries_by_type_;
   std::vector<int> num_to_delete_entries_by_type_;
 
   bool is_initialized_;
 };
 
 }  // namespace sessions
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_SESSIONS_SYNC_SESSION_SNAPSHOT_H_