Bind Window focus ability to the ExecutionContext instead of the process.

public/web/WebScopedWindowFocusAllowedIndicator.h

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebScopedWindowFocusAllowedIndicator_h
 #define WebScopedWindowFocusAllowedIndicator_h
 
 #include "public/platform/WebPrivateOwnPtr.h"
 
 namespace blink {
 
+class ScopedWindowFocusAllowedIndicator;
+class WebDocument;
 class WindowFocusAllowedIndicator;
 
 class WebScopedWindowFocusAllowedIndicator {
 public:
+    explicit WebScopedWindowFocusAllowedIndicator(WebDocument* document) { initialize(document); }
+    // FIXME: this constructor is now deprecated. It will be removed as part of
+    // https://crbug.com/440740
     WebScopedWindowFocusAllowedIndicator() { initialize(); }
     ~WebScopedWindowFocusAllowedIndicator() { reset(); }
 
 private:
+    BLINK_EXPORT void initialize(WebDocument*);
     BLINK_EXPORT void initialize();
     BLINK_EXPORT void reset();
 
+    // FIXME: m_indicator is now deprecated. It will be removed as part of
+    // https://crbug.com/440740
     WebPrivateOwnPtr<WindowFocusAllowedIndicator> m_indicator;
+    WebPrivateOwnPtr<ScopedWindowFocusAllowedIndicator> m_private;
 };
 
 }
 
 #endif // WebScopedWindowFocusAllowedIndicator_h