Move showLineTreeAndMark() to LayoutBlockFlow.

third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp

Index: third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp b/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
index 078c1b08de5eb473135d85436c0c0f17c311ee5e..2c4722d13bd558122d29b07abbb23c7f54ef4204 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
@@ -3106,4 +3106,15 @@ bool LayoutBlockFlow::recalcInlineChildrenOverflowAfterStyleChange()
     return childrenOverflowChanged;
 }
 
+#ifndef NDEBUG
+
+void LayoutBlockFlow::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const LayoutObject* obj) const
+{
+    showLayoutObject();
+    for (const RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox())
+        root->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, 1);
+}
+
+#endif
+
 } // namespace blink