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

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

Index: ios/chrome/browser/ui/tab_switcher/session_changes.mm
diff --git a/ios/chrome/browser/ui/tab_switcher/session_changes.mm b/ios/chrome/browser/ui/tab_switcher/session_changes.mm
new file mode 100644
index 0000000000000000000000000000000000000000..3e06b5245695d93056f71f1bd56783b9cc1f2149
--- /dev/null
+++ b/ios/chrome/browser/ui/tab_switcher/session_changes.mm
@@ -0,0 +1,35 @@
+// 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