Implement NavigationThrottle::BLOCK_REQUEST_AND_COLLAPSE.

third_party/WebKit/Source/core/html/HTMLIFrameElement.h

Index: third_party/WebKit/Source/core/html/HTMLIFrameElement.h
diff --git a/third_party/WebKit/Source/core/html/HTMLIFrameElement.h b/third_party/WebKit/Source/core/html/HTMLIFrameElement.h
index 31c1eb6a0afdadf1993d34478e8211a1a619070f..436015fa62bc03ac9b268039af4c7fbffba090e1 100644
--- a/third_party/WebKit/Source/core/html/HTMLIFrameElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLIFrameElement.h
@@ -53,6 +53,8 @@ class CORE_EXPORT HTMLIFrameElement final
  private:
   explicit HTMLIFrameElement(Document&);
 
+  void SetCollapsedByClient(bool) override;
+
   void ParseAttribute(const AttributeModificationParams&) override;
   bool IsPresentationAttribute(const QualifiedName&) const override;
   void CollectStyleForPresentationAttribute(const QualifiedName&,
@@ -88,6 +90,7 @@ class CORE_EXPORT HTMLIFrameElement final
   bool did_load_non_empty_document_;
   bool allow_fullscreen_;
   bool allow_payment_request_;
+  bool collapsedByClient;

[alexmos, 2017/04/11 06:00:30]

collapsed_by_client_

[engedy, 2017/04/11 08:06:17]

Wops, old CL from before the reformat. Done.

   Member<HTMLIFrameElementSandbox> sandbox_;
   Member<HTMLIFrameElementAllow> allow_;