Upstream Chrome on iOS source code [9/11].

ios/chrome/browser/ui/tab_switcher/session_changes.mm

+// Copyright 2016 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.
+
+#import "ios/chrome/browser/ui/tab_switcher/session_changes.h"
+
+#import "ios/chrome/browser/ui/tab_switcher/tab_switcher_utils.h"
+
+namespace ios_internal {
+
+SessionChanges::SessionChanges(
+    std::vector<size_t> const& tabHashesInInitialState,
+    std::vector<size_t> const& tabHashesInFinalState) {
+  ios_internal::MinimalReplacementOperations(tabHashesInInitialState,
+                                             tabHashesInFinalState, &updates_,
+                                             &deletions_, &insertions_);
+}
+
+SessionChanges::~SessionChanges() {}
+
+std::vector<size_t> const& SessionChanges::deletions() const {
+  return deletions_;
+}
+std::vector<size_t> const& SessionChanges::insertions() const {
+  return insertions_;
+}
+std::vector<size_t> const& SessionChanges::updates() const {
+  return updates_;
+}
+
+bool SessionChanges::hasChanges() const {
+  return updates_.size() || deletions_.size() || insertions_.size();
+}
+
+}  // namespace ios_internal