Add an iframe permissions= attribute for implementing permission delegation

third_party/WebKit/Source/core/html/HTMLIFrameElement.h

Index: third_party/WebKit/Source/core/html/HTMLIFrameElement.h
diff --git a/third_party/WebKit/Source/core/html/HTMLIFrameElement.h b/third_party/WebKit/Source/core/html/HTMLIFrameElement.h
index 752d0c86fd74027d6b6bfba9a66867b963511cd0..9a348963aae9b70e5d4f3575f92a7338d81a59b5 100644
--- a/third_party/WebKit/Source/core/html/HTMLIFrameElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLIFrameElement.h
@@ -25,7 +25,10 @@
 #define HTMLIFrameElement_h
 
 #include "core/html/HTMLFrameElementBase.h"
+#include "core/html/HTMLIFrameElementPermissions.h"
 #include "core/html/HTMLIFrameElementSandbox.h"
+#include "public/platform/WebVector.h"
+#include "public/platform/modules/permissions/WebPermissionType.h"
 
 namespace blink {
 
@@ -37,6 +40,7 @@ public:
     DECLARE_VIRTUAL_TRACE();
     ~HTMLIFrameElement() override;
     DOMTokenList* sandbox() const;
+    DOMTokenList* permissions() const;
 
 private:
     explicit HTMLIFrameElement(Document&);
@@ -56,15 +60,22 @@ private:
     bool isInteractiveContent() const override;
 
     void valueWasSet() override;
+    void sandboxValueWasSet();
+    void permissionsValueWasSet();
 
     ReferrerPolicy referrerPolicyAttribute() override;
 
     bool allowFullscreen() const override { return m_allowFullscreen; }
 
+    const WebVector<WebPermissionType>* delegatedPermissions() const override { return &m_delegatedPermissions; }
+
     AtomicString m_name;
     bool m_didLoadNonEmptyDocument;
     bool m_allowFullscreen;
     Member<HTMLIFrameElementSandbox> m_sandbox;
+    Member<HTMLIFrameElementPermissions> m_permissions;
+
+    WebVector<WebPermissionType> m_delegatedPermissions;
 
     ReferrerPolicy m_referrerPolicy;
 };