Use the baseline information exposed by C++ to pipe baseline data through RenderBox.

sky/engine/core/rendering/RenderFlexibleBox.cpp

Index: sky/engine/core/rendering/RenderFlexibleBox.cpp
diff --git a/sky/engine/core/rendering/RenderFlexibleBox.cpp b/sky/engine/core/rendering/RenderFlexibleBox.cpp
index bfd8e9775d37444bfce59cd9ec3aa609c52ceca1..dc0672507efc496e67fa941a12a2b7c71dfe4326 100644
--- a/sky/engine/core/rendering/RenderFlexibleBox.cpp
+++ b/sky/engine/core/rendering/RenderFlexibleBox.cpp
@@ -126,7 +126,7 @@ int RenderFlexibleBox::baselinePosition(FontBaseline, bool, LineDirectionMode di
     return beforeMarginInLineDirection(direction) + baseline;
 }
 
-int RenderFlexibleBox::firstLineBoxBaseline() const
+int RenderFlexibleBox::firstLineBoxBaseline(bool autoBaseline, FontBaseline baselineType) const
 {
     if (m_numberOfInFlowChildrenOnFirstLine <= 0)
         return -1;
@@ -155,7 +155,7 @@ int RenderFlexibleBox::firstLineBoxBaseline() const
     if (isColumnFlow() && !hasOrthogonalFlow(baselineChild))
         return mainAxisExtentForChild(baselineChild) + baselineChild->logicalTop();
 
-    int baseline = baselineChild->firstLineBoxBaseline();
+    int baseline = baselineChild->firstLineBoxBaseline(autoBaseline, baselineType);
     if (baseline == -1) {
         // FIXME: We should pass |direction| into firstLineBoxBaseline and stop bailing out if we're a writing mode root.
         // This would also fix some cases where the flexbox is orthogonal to its container.