Add a DevTools command to create an isolated world for a given frame

third_party/WebKit/Source/core/inspector/InspectorPageAgent.h

Index: third_party/WebKit/Source/core/inspector/InspectorPageAgent.h
diff --git a/third_party/WebKit/Source/core/inspector/InspectorPageAgent.h b/third_party/WebKit/Source/core/inspector/InspectorPageAgent.h
index 48ec089b26d96c24ceb47bcb75bf67b392c7880c..a2dfc0c2b8429d5a98e5cfbbb95233e6574b5cb5 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorPageAgent.h
+++ b/third_party/WebKit/Source/core/inspector/InspectorPageAgent.h
@@ -142,6 +142,11 @@ class CORE_EXPORT InspectorPageAgent final
       std::unique_ptr<protocol::Page::LayoutViewport>*,
       std::unique_ptr<protocol::Page::VisualViewport>*,
       std::unique_ptr<protocol::DOM::Rect>*) override;
+  protocol::Response ensureIsolatedWorld(
+      const String& frame_id,
+      int world_id,
+      Maybe<String> security_origin,
+      Maybe<String> content_security_policy) override;
 
   // InspectorInstrumentation API
   void DidClearDocumentOfWindowObject(LocalFrame*);