Bug 1174546 part 2 - [css-grid] Implement the 'auto' min-sizing function in Grid layout. r=jfkthame

layout/generic/nsGridContainerFrame.cpp

@@ -225,10 +225,13 @@ struct MOZ_STACK_CLASS nsGridContainerFrame::TrackSizingFunctions
  */
 struct MOZ_STACK_CLASS nsGridContainerFrame::Tracks
 {
+  explicit Tracks(Dimension aDimension) : mDimension(aDimension) {}
+
   void Initialize(const TrackSizingFunctions& aFunctions,
                   nscoord                     aPercentageBasis);
 
   nsAutoTArray<TrackSize, 32> mSizes;
+  Dimension mDimension;
 };
 
 struct MOZ_STACK_CLASS nsGridContainerFrame::GridReflowState
@@ -267,6 +270,8 @@ private:
                   const WritingMode&       aWM)
     : mIter(aFrame, kPrincipalList)
     , mGridStyle(aGridStyle)
+    , mCols(eColDimension)
+    , mRows(eRowDimension)
     , mColFunctions({
         mGridStyle->mGridTemplateColumns.mMinTrackSizingFunctions,
         mGridStyle->mGridTemplateColumns.mMaxTrackSizingFunctions,
@@ -1252,6 +1257,19 @@ nsGridContainerFrame::Tracks::Initialize(const TrackSizingFunctions& aFunctions,
   }
 }
 
+#if 0
+static nscoord
+MinSize(nsIFrame* aChild, nsRenderingContext* aRC, WritingMode aCBWM,
+        nsGridContainerFrame::Dimension aDimension,
+        nsLayoutUtils::IntrinsicISizeType aConstraint)
+{
+  PhysicalAxis axis(((aDimension == nsGridContainerFrame::eColDimension) ==
+                     aCBWM.IsVertical()) ? eAxisVertical : eAxisHorizontal);
+  return nsLayoutUtils::MinSizeContributionForAxis(axis, aRC, aChild,
+                                                   aConstraint);
+}
+#endif
+
 void
 nsGridContainerFrame::CalculateTrackSizes(GridReflowState&   aState,
                                           const LogicalSize& aContentBox)

layout/generic/nsGridContainerFrame.h

@@ -54,6 +54,8 @@ public:
     nscoord mLimit;
   };
 
+  enum Dimension { eColDimension, eRowDimension };
+
   // @see nsAbsoluteContainingBlock::Reflow about this magic number
   static const nscoord VERY_LIKELY_A_GRID_CONTAINER = -123456789;