Split more Paragraph-specific code from RenderBlock into RenderParagraph

sky/engine/core/rendering/RenderParagraph.h

Index: sky/engine/core/rendering/RenderParagraph.h
diff --git a/sky/engine/core/rendering/RenderParagraph.h b/sky/engine/core/rendering/RenderParagraph.h
index fa375090a1ca8ce2be1905e0859a574b33667ad5..b5893886e206e01cb84e83843d7eec4565205094 100644
--- a/sky/engine/core/rendering/RenderParagraph.h
+++ b/sky/engine/core/rendering/RenderParagraph.h
@@ -21,6 +21,12 @@ public:
 
     bool isRenderParagraph() const override { return true; }
 
+    virtual RootInlineBox* lineAtIndex(int) const;
+    virtual int lineCount(const RootInlineBox* = 0, bool* = 0) const;
+
+    GapRects inlineSelectionGaps(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
+        LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo*);
+
 protected:
     void layoutChildren(bool relayoutChildren, SubtreeLayoutScope&, LayoutUnit& paintInvalidationLogicalTop, LayoutUnit& paintInvalidationLogicalBottom, LayoutUnit beforeEdge, LayoutUnit afterEdge) final;
 
@@ -36,6 +42,9 @@ protected:
 
     void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const final;
 
+    int firstLineBoxBaseline() const final;
+    int lastLineBoxBaseline(LineDirectionMode) const final;
+
 private:
     void markLinesDirtyInBlockRange(LayoutUnit logicalTop, LayoutUnit logicalBottom, RootInlineBox* highest = 0);