1 files changed, 25 insertions, 0 deletions
diff --git a/chromium/third_party/blink/renderer/modules/csspaint/paint_worklet_id_generator.cc b/chromium/third_party/blink/renderer/modules/csspaint/paint_worklet_id_generator.cc
new file mode 100644
index 00000000000..89afa58c888
--- /dev/null
+++ b/chromium/third_party/blink/renderer/modules/csspaint/paint_worklet_id_generator.cc
@@ -0,0 +1,25 @@
+// Copyright 2020 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 "third_party/blink/renderer/modules/csspaint/paint_worklet_id_generator.h"
+
+#include <limits>
+
+#include "base/check_op.h"
+
+namespace blink {
+
+namespace {
+// Note that the NextId() is called from the main thread only, and that's why
+// it is fine with current_id being int. In the future, if NextId is called from
+// a thread other than the main thread, then we should use AtomicSequenceNumber.
+static int current_id = 0;
+}  // namespace
+
+int PaintWorkletIdGenerator::NextId() {
+  CHECK_LT(current_id, std::numeric_limits<int>::max());
+  return ++current_id;
+}
+
+}  // namespace blink