NOT YET READY: Improve granularity of window namespaces in Blink.

third_party/WebKit/Source/core/page/Page.h

Index: third_party/WebKit/Source/core/page/Page.h
diff --git a/third_party/WebKit/Source/core/page/Page.h b/third_party/WebKit/Source/core/page/Page.h
index ccaea49b60b03068fd46c1032360ba34ddf107ae..eb6680ecf26cd2324eebc751a052a154e57e7ae9 100644
--- a/third_party/WebKit/Source/core/page/Page.h
+++ b/third_party/WebKit/Source/core/page/Page.h
@@ -110,7 +110,7 @@ class CORE_EXPORT Page final : public GarbageCollectedFinalized<Page>,
   }
 
   // An "ordinary" page is a fully-featured page owned by a web view.
-  static Page* CreateOrdinary(PageClients&);
+  static Page* CreateOrdinary(PageClients&, Page* opener);
 
   ~Page() override;
 
@@ -126,6 +126,11 @@ class CORE_EXPORT Page final : public GarbageCollectedFinalized<Page>,
   // (SVGImages, inspector overlays, page popups etc.)
   static PageSet& OrdinaryPages();
 
+  // Returns pages related to the current browsing context (excluding the
+  // current page).  See also
+  // https://html.spec.whatwg.org/multipage/browsers.html#unit-of-related-browsing-contexts
+  HeapVector<Member<Page>> RelatedPages();
+
   static void PlatformColorsChanged();
 
   void SetNeedsRecalcStyleInAllFrames();
@@ -369,6 +374,11 @@ class CORE_EXPORT Page final : public GarbageCollectedFinalized<Page>,
 #endif
 
   int subframe_count_;
+
+  // The next 2 fields form a circular, double-linked list of pages that are
+  // related to the current browsing context.  See also RelatedPages method.
+  Member<Page> next_related_page_;
+  Member<Page> prev_related_page_;
 };
 
 extern template class CORE_EXTERN_TEMPLATE_EXPORT Supplement<Page>;