1 files changed, 51 insertions, 0 deletions
diff --git a/chromium/third_party/blink/renderer/core/html/portal/document_portals.cc b/chromium/third_party/blink/renderer/core/html/portal/document_portals.cc
new file mode 100644
index 00000000000..4afc5ddc4fe
--- /dev/null
+++ b/chromium/third_party/blink/renderer/core/html/portal/document_portals.cc
@@ -0,0 +1,51 @@
+// Copyright 2018 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/core/html/portal/document_portals.h"
+
+#include "third_party/blink/renderer/core/html/portal/html_portal_element.h"
+
+namespace blink {
+
+// static
+const char DocumentPortals::kSupplementName[] = "DocumentPortals";
+
+// static
+DocumentPortals& DocumentPortals::From(Document& document) {
+  DocumentPortals* supplement =
+      Supplement<Document>::From<DocumentPortals>(document);
+  if (!supplement) {
+    supplement = new DocumentPortals(document);
+    Supplement<Document>::ProvideTo(document, supplement);
+  }
+  return *supplement;
+}
+
+DocumentPortals::DocumentPortals(Document& document)
+    : Supplement<Document>(document) {}
+
+void DocumentPortals::OnPortalInserted(HTMLPortalElement* portal) {
+  portals_.push_back(portal);
+}
+
+void DocumentPortals::OnPortalRemoved(HTMLPortalElement* portal) {
+  portals_.EraseAt(portals_.Find(portal));
+}
+
+HTMLPortalElement* DocumentPortals::GetPortal(
+    const base::UnguessableToken& token) const {
+  for (HTMLPortalElement* portal : portals_) {
+    if (portal->GetToken() == token)
+      return portal;
+  }
+
+  return nullptr;
+}
+
+void DocumentPortals::Trace(Visitor* visitor) {
+  Supplement<Document>::Trace(visitor);
+  visitor->Trace(portals_);
+}
+
+}  // namespace blink