Bug 1085214 - Implement location.ancestorOrigins r=necko-reviewers,webidl,dom-core,smaug,jesup,zcorpan

This implements this attribute on Location and also adheres to the
changes to the spec introduced in
whatwg/html#11560

Tentative tests are also added in this patch.

Differential Revision: https://phabricator.services.mozilla.com/D273393

UltraBlame original commit: 626bfdb90f3e1a0f78c6a6e832697520396e66bf

Author: marco-c

docshell/base/CanonicalBrowsingContext.cpp

@@ -481,6 +481,13 @@ h
 #
 include
 "
+nsScriptSecurityManager
+.
+h
+"
+#
+include
+"
 nsSecureBrowserUI
 .
 h
@@ -19980,6 +19987,311 @@ ReconstructContiguousEntryList
 ;
 }
 }
+void
+CanonicalBrowsingContext
+:
+:
+CreateRedactedAncestorOriginsList
+(
+nsIPrincipal
+*
+aThisDocumentPrincipal
+)
+{
+MOZ_DIAGNOSTIC_ASSERT
+(
+aThisDocumentPrincipal
+)
+;
+nsTArray
+<
+nsCOMPtr
+<
+nsIPrincipal
+>
+>
+ancestorPrincipals
+;
+CanonicalBrowsingContext
+*
+parent
+=
+GetParent
+(
+)
+;
+if
+(
+!
+parent
+)
+{
+mPossiblyRedactedAncestorOriginsList
+=
+std
+:
+:
+move
+(
+ancestorPrincipals
+)
+;
+return
+;
+}
+MOZ_DIAGNOSTIC_ASSERT
+(
+!
+parent
+-
+>
+IsChrome
+(
+)
+)
+;
+const
+Span
+<
+const
+nsCOMPtr
+<
+nsIPrincipal
+>
+>
+parentAncestorOriginsList
+=
+parent
+-
+>
+GetPossiblyRedactedAncestorOriginsList
+(
+)
+;
+WindowGlobalParent
+*
+ancestorWGP
+=
+GetParentWindowContext
+(
+)
+;
+auto
+referrerPolicy
+=
+GetEmbedderFrameReferrerPolicy
+(
+)
+;
+bool
+masked
+=
+false
+;
+if
+(
+referrerPolicy
+=
+=
+ReferrerPolicy
+:
+:
+No_referrer
+)
+{
+masked
+=
+true
+;
+}
+else
+if
+(
+referrerPolicy
+=
+=
+ReferrerPolicy
+:
+:
+Same_origin
+&
+&
+!
+ancestorWGP
+-
+>
+DocumentPrincipal
+(
+)
+-
+>
+Equals
+(
+aThisDocumentPrincipal
+)
+)
+{
+masked
+=
+true
+;
+}
+if
+(
+masked
+)
+{
+ancestorPrincipals
+.
+AppendElement
+(
+nullptr
+)
+;
+}
+else
+{
+auto
+*
+principal
+=
+ancestorWGP
+-
+>
+DocumentPrincipal
+(
+)
+;
+ancestorPrincipals
+.
+AppendElement
+(
+principal
+-
+>
+GetIsNullPrincipal
+(
+)
+?
+nullptr
+:
+principal
+)
+;
+}
+for
+(
+const
+auto
+&
+ancestorOrigin
+:
+parentAncestorOriginsList
+)
+{
+if
+(
+masked
+&
+&
+ancestorOrigin
+&
+&
+ancestorOrigin
+-
+>
+Equals
+(
+ancestorWGP
+-
+>
+DocumentPrincipal
+(
+)
+)
+)
+{
+ancestorPrincipals
+.
+AppendElement
+(
+nullptr
+)
+;
+}
+else
+{
+ancestorPrincipals
+.
+AppendElement
+(
+ancestorOrigin
+)
+;
+masked
+=
+false
+;
+}
+}
+mPossiblyRedactedAncestorOriginsList
+=
+std
+:
+:
+move
+(
+ancestorPrincipals
+)
+;
+}
+Span
+<
+const
+nsCOMPtr
+<
+nsIPrincipal
+>
+>
+CanonicalBrowsingContext
+:
+:
+GetPossiblyRedactedAncestorOriginsList
+(
+)
+const
+{
+return
+mPossiblyRedactedAncestorOriginsList
+;
+}
+void
+CanonicalBrowsingContext
+:
+:
+SetPossiblyRedactedAncestorOriginsList
+(
+nsTArray
+<
+nsCOMPtr
+<
+nsIPrincipal
+>
+>
+aAncestorOriginsList
+)
+{
+mPossiblyRedactedAncestorOriginsList
+=
+std
+:
+:
+move
+(
+aAncestorOriginsList
+)
+;
+}
 EntryList
 *
 CanonicalBrowsingContext