Bug 1415352: Part 1a - Pass subject principal through to ParseAttribute. r=bz

This is necessary in order to parse style attributes using the subject
principal of the caller, rather than defaulting to the page principal.

MozReview-Commit-ID: GIshajQ28la

dom/html/HTMLInputElement.h

@@ -195,6 +195,7 @@ public:
   virtual bool ParseAttribute(int32_t aNamespaceID,
                                 nsAtom* aAttribute,
                                 const nsAString& aValue,
+                                nsIPrincipal* aMaybeScriptedPrincipal,
                                 nsAttrValue& aResult) override;
   virtual nsChangeHint GetAttributeChangeHint(const nsAtom* aAttribute,
                                               int32_t aModType) const override;