Add option to dump line box tree when dumping layout tree.

Source/core/layout/LayoutTreeAsText.cpp

Index: Source/core/layout/LayoutTreeAsText.cpp
diff --git a/Source/core/layout/LayoutTreeAsText.cpp b/Source/core/layout/LayoutTreeAsText.cpp
index 8dc7c93b5ae6a51a6900a890fdca7c108dc7b303..7c213b27104ca8cb38f410b9ab44b4396a2a30ea 100644
--- a/Source/core/layout/LayoutTreeAsText.cpp
+++ b/Source/core/layout/LayoutTreeAsText.cpp
@@ -35,6 +35,7 @@
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLElement.h"
+#include "core/layout/LayoutBlockFlow.h"
 #include "core/layout/LayoutDetailsMarker.h"
 #include "core/layout/LayoutFileUploadControl.h"
 #include "core/layout/LayoutInline.h"
@@ -55,6 +56,7 @@
 #include "core/layout/svg/SVGLayoutTreeAsText.h"
 #include "core/page/PrintContext.h"
 #include "core/paint/DeprecatedPaintLayer.h"
+#include "platform/LayoutUnit.h"
 #include "wtf/HexNumber.h"
 #include "wtf/Vector.h"
 #include "wtf/unicode/CharacterNames.h"
@@ -404,6 +406,52 @@ void LayoutTreeAsText::writeLayoutObject(TextStream& ts, const LayoutObject& o,
     }
 }
 
+static void writeInlineBox(TextStream& ts, const InlineBox& box, int indent)
+{
+    writeIndent(ts, indent);
+    ts << "+ ";
+    ts << box.boxName() << " {" << box.layoutObject().debugName() << "}"
+        << " pos=(" << box.x() << "," << box.y() << ")"
+        << " size=(" << box.width() << "," << box.height() << ")"
+        << " baseline=" << box.baselinePosition(AlphabeticBaseline)
+        << "/" << box.baselinePosition(IdeographicBaseline);
+}
+
+static void writeInlineTextBox(TextStream& ts, const InlineTextBox& textBox, int indent)
+{
+    writeInlineBox(ts, textBox, indent);
+    String value = textBox.text();
+    value.replaceWithLiteral('\\', "\\\\");
+    value.replaceWithLiteral('\n', "\\n");
+    value.replaceWithLiteral('"', "\\\"");
+    ts << " range=(" << textBox.start() << "," << (textBox.start() + textBox.len()) << ")"
+        << " \"" << value << "\"";
+}
+
+static void writeInlineFlowBox(TextStream& ts, const InlineFlowBox& rootBox, int indent)
+{
+    writeInlineBox(ts, rootBox, indent);
+    ts << "\n";
+    for (const InlineBox* box = rootBox.firstChild(); box; box = box->nextOnLine()) {
+        if (box->isInlineFlowBox()) {
+            writeInlineFlowBox(ts, static_cast<const InlineFlowBox&>(*box), indent + 1);
+            continue;
+        }
+        if (box->isInlineTextBox())
+            writeInlineTextBox(ts, static_cast<const InlineTextBox&>(*box), indent + 1);
+        else
+            writeInlineBox(ts, *box, indent + 1);
+        ts << "\n";
+    }
+}
+
+void LayoutTreeAsText::writeLineBoxTree(TextStream& ts, const LayoutBlockFlow& o, int indent)
+{
+    for (const InlineFlowBox* rootBox = o.firstLineBox(); rootBox; rootBox = rootBox->nextLineBox()) {
+        writeInlineFlowBox(ts, *rootBox, indent);
+    }
+}
+
 static void writeTextRun(TextStream& ts, const LayoutText& o, const InlineTextBox& run)
 {
     // FIXME: For now use an "enclosingIntRect" model for x, y and logicalWidth, although this makes it harder
@@ -469,6 +517,10 @@ void write(TextStream& ts, const LayoutObject& o, int indent, LayoutAsTextBehavi
     LayoutTreeAsText::writeLayoutObject(ts, o, behavior);
     ts << "\n";
 
+    if ((behavior & LayoutAsTextShowLineTrees) && o.isLayoutBlockFlow()) {
+        LayoutTreeAsText::writeLineBoxTree(ts, toLayoutBlockFlow(o), indent + 1);
+    }
+
     if (o.isText() && !o.isBR()) {
         const LayoutText& text = toLayoutText(o);
         for (InlineTextBox* box = text.firstTextBox(); box; box = box->nextTextBox()) {