Add an iframe permissions= attribute for implementing permission delegation

third_party/WebKit/Source/core/frame/FrameOwner.h

Index: third_party/WebKit/Source/core/frame/FrameOwner.h
diff --git a/third_party/WebKit/Source/core/frame/FrameOwner.h b/third_party/WebKit/Source/core/frame/FrameOwner.h
index af018883fc385c0fecf62a37fd8660c768153209..324e33ef53e9a6c04264f22ba1950cf199ee146c 100644
--- a/third_party/WebKit/Source/core/frame/FrameOwner.h
+++ b/third_party/WebKit/Source/core/frame/FrameOwner.h
@@ -9,6 +9,8 @@
 #include "core/dom/SandboxFlags.h"
 #include "platform/heap/Handle.h"
 #include "platform/scroll/ScrollTypes.h"
+#include "public/platform/WebVector.h"
+#include "public/platform/modules/permissions/WebPermissionType.h"
 
 namespace blink {
 
@@ -39,6 +41,7 @@ public:
     virtual int marginWidth() const = 0;
     virtual int marginHeight() const = 0;
     virtual bool allowFullscreen() const = 0;
+    virtual const WebVector<WebPermissionType>* delegatedPermissions() const = 0;
 };
 
 class CORE_EXPORT DummyFrameOwner : public GarbageCollectedFinalized<DummyFrameOwner>, public FrameOwner {
@@ -61,6 +64,7 @@ public:
     int marginWidth() const override { return -1; }
     int marginHeight() const override { return -1; }
     bool allowFullscreen() const override { return false; }
+    const WebVector<WebPermissionType>* delegatedPermissions() const override { return nullptr; }
 
 private:
     // Intentionally private to prevent redundant checks when the type is