Bug 1321698 part 1: Set a frame state bit on nsFlexContainerFrame if it's emulating -webkit-box. r=mats

MozReview-Commit-ID: 5eL55atUBnT

--HG--
extra : rebase_source : c947804edfadd1b9aa3630e1f1e57484b98adb59

layout/generic/nsFlexContainerFrame.cpp

@@ -87,6 +87,8 @@ IsDisplayValueLegacyBox(const nsStyleDisplay* aStyleDisp)
     aStyleDisp->mDisplay == mozilla::StyleDisplay::WebkitInlineBox;
 }
 
+// XXXdholbert This will be merged into Init(), in a later patch in this series
+// (after all callers have been converted to check frame state bit).
 /* static */ bool
 nsFlexContainerFrame::IsLegacyBox(const nsIFrame* aFrame)
 {
@@ -2274,6 +2276,21 @@ nsFlexContainerFrame::~nsFlexContainerFrame()
 {
 }
 
+/* virtual */
+void
+nsFlexContainerFrame::Init(nsIContent*       aContent,
+                           nsContainerFrame* aParent,
+                           nsIFrame*         aPrevInFlow)
+{
+  nsContainerFrame::Init(aContent, aParent, aPrevInFlow);
+
+  if (nsFlexContainerFrame::IsLegacyBox(this)) {
+    // Toggle frame state bit to indicate that this frame represents a
+    // legacy -webkit-{inline-}box container:
+    AddStateBits(NS_STATE_FLEX_IS_LEGACY_WEBKIT_BOX);
+  }
+}
+
 template<bool IsLessThanOrEqual(nsIFrame*, nsIFrame*)>
 /* static */ bool
 nsFlexContainerFrame::SortChildrenIfNeeded()

layout/generic/nsFlexContainerFrame.h

@@ -58,6 +58,10 @@ public:
   struct StrutInfo;
 
   // nsIFrame overrides
+  void Init(nsIContent*       aContent,
+            nsContainerFrame* aParent,
+            nsIFrame*         aPrevInFlow) override;
+
   virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                 const nsRect&           aDirtyRect,
                                 const nsDisplayListSet& aLists) override;

layout/generic/nsFrameStateBits.h

@@ -307,6 +307,10 @@ FRAME_STATE_GROUP(FlexContainer, nsFlexContainerFrame)
 // (Means that we have to be more thorough about checking them for sortedness.)
 FRAME_STATE_BIT(FlexContainer, 20, NS_STATE_FLEX_CHILDREN_REORDERED)
 
+// Set for a flex container that is emulating a legacy
+// 'display:-webkit-{inline-}box' container.
+FRAME_STATE_BIT(FlexContainer, 21, NS_STATE_FLEX_IS_LEGACY_WEBKIT_BOX)
+
 // == Frame state bits that apply to grid container frames ====================
 
 FRAME_STATE_GROUP(GridContainer, nsGridContainerFrame)