Bug 1364805 part 2 - Add a nsIFrame::mClass field and propagate the concrete class' value up the ctor chain. r=jfkthame

nsIFrame::mClass is of type enum class nsQueryFrame::ClassID which is
a strict subset of the nsQueryFrame::FrameIID values.  For a concrete
frame class, its FrameIID is the same numeric value as its ClassID.

MozReview-Commit-ID: 1N0AkCGo1ol

layout/forms/nsHTMLButtonControlFrame.cpp

@@ -27,8 +27,9 @@ NS_NewHTMLButtonControlFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
 NS_IMPL_FRAMEARENA_HELPERS(nsHTMLButtonControlFrame)
 
 nsHTMLButtonControlFrame::nsHTMLButtonControlFrame(nsStyleContext* aContext,
+                                                   nsIFrame::ClassID aID,
                                                    LayoutFrameType aType)
-  : nsContainerFrame(aContext, aType)
+  : nsContainerFrame(aContext, aID, aType)
 {
 }