Reenable framebusting deprecation, change it to allow navigation if iframe has ever had a user gestu

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

Index: third_party/WebKit/Source/core/dom/Document.h
diff --git a/third_party/WebKit/Source/core/dom/Document.h b/third_party/WebKit/Source/core/dom/Document.h
index 31e6fa093898b30380fa398822e1db26da368d18..a2deee2703f00c1759190730e69e4032f992a52d 100644
--- a/third_party/WebKit/Source/core/dom/Document.h
+++ b/third_party/WebKit/Source/core/dom/Document.h
@@ -1283,6 +1283,9 @@ class CORE_EXPORT Document : public ContainerNode,
 
   PropertyRegistry* propertyRegistry();
 
+  void setHasReceivedUserGesture() { m_hasReceivedUserGesture = true; }
+  bool hasReceivedUserGesture() const { return m_hasReceivedUserGesture; }

[Rick Byers, 2016/10/06 16:26:46]

nit: add a comment documenting the semantics here, especially the limitation
that it isn't yet aware of ALL sources of user gestures.

+
  protected:
   Document(const DocumentInit&, DocumentClassFlags = DefaultDocumentClass);
 
@@ -1528,6 +1531,7 @@ class CORE_EXPORT Document : public ContainerNode,
 
   bool m_designMode;
   bool m_isRunningExecCommand;
+  bool m_hasReceivedUserGesture;
 
   HeapHashSet<WeakMember<const LiveNodeListBase>> m_listsInvalidatedAtDocument;
   // Oilpan keeps track of all registered NodeLists.