Make custom elements work in HTML imports

third_party/WebKit/Source/core/dom/ExecutionContext.h

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2012 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 70 matching lines @@
     virtual bool isPaintWorkletGlobalScope() const { return false; }
     virtual bool isJSExecutionForbidden() const { return false; }
 
     virtual bool isContextThread() const { return true; }
 
     SecurityOrigin* getSecurityOrigin();
     ContentSecurityPolicy* contentSecurityPolicy();
     const KURL& url() const;
     KURL completeURL(const String& url) const;
     virtual void disableEval(const String& errorMessage) = 0;
-    virtual LocalDOMWindow* executingWindow() { return 0; }
+    virtual LocalDOMWindow* executingWindow() const { return 0; }
     virtual String userAgent() const = 0;
     virtual void postTask(const WebTraceLocation&, std::unique_ptr<ExecutionContextTask>, const String& taskNameForInstrumentation = emptyString()) = 0; // Executes the task on context's thread asynchronously.
 
     // Gets the DOMTimerCoordinator which maintains the "active timer
     // list" of tasks created by setTimeout and setInterval. The
     // DOMTimerCoordinator is owned by the ExecutionContext and should
     // not be used after the ExecutionContext is destroyed.
     virtual DOMTimerCoordinator* timers() = 0;
 
     virtual SecurityContext& securityContext() = 0;
@@ skipping 83 matching lines @@
 
     Deque<std::unique_ptr<SuspendableTask>> m_suspendedTasks;
     bool m_isRunSuspendableTasksScheduled;
 
     ReferrerPolicy m_referrerPolicy;
 };
 
 } // namespace blink
 
 #endif // ExecutionContext_h