HTML parser: Add show/toString() debug helper methods

third_party/WebKit/Source/core/html/parser/HTMLTreeBuilder.cpp

Index: third_party/WebKit/Source/core/html/parser/HTMLTreeBuilder.cpp
diff --git a/third_party/WebKit/Source/core/html/parser/HTMLTreeBuilder.cpp b/third_party/WebKit/Source/core/html/parser/HTMLTreeBuilder.cpp
index 7461e3f6a1d48f969a4440d277db8d7950be15de..eeb78031414d74fbce2f4d07947f5caf15b8edbf 100644
--- a/third_party/WebKit/Source/core/html/parser/HTMLTreeBuilder.cpp
+++ b/third_party/WebKit/Source/core/html/parser/HTMLTreeBuilder.cpp
@@ -2802,4 +2802,38 @@ void HTMLTreeBuilder::parseError(AtomicHTMLToken*)
 {
 }
 
+#ifndef NDEBUG
+const char* HTMLTreeBuilder::toString(HTMLTreeBuilder::InsertionMode mode)
+{
+    switch (mode) {
+#define DEFINE_STRINGIFY(mode) case mode: return #mode;
+        DEFINE_STRINGIFY(InitialMode)
+        DEFINE_STRINGIFY(BeforeHTMLMode)
+        DEFINE_STRINGIFY(BeforeHeadMode)
+        DEFINE_STRINGIFY(InHeadMode)
+        DEFINE_STRINGIFY(InHeadNoscriptMode)
+        DEFINE_STRINGIFY(AfterHeadMode)
+        DEFINE_STRINGIFY(TemplateContentsMode)
+        DEFINE_STRINGIFY(InBodyMode)
+        DEFINE_STRINGIFY(TextMode)
+        DEFINE_STRINGIFY(InTableMode)
+        DEFINE_STRINGIFY(InTableTextMode)
+        DEFINE_STRINGIFY(InCaptionMode)
+        DEFINE_STRINGIFY(InColumnGroupMode)
+        DEFINE_STRINGIFY(InTableBodyMode)
+        DEFINE_STRINGIFY(InRowMode)
+        DEFINE_STRINGIFY(InCellMode)
+        DEFINE_STRINGIFY(InSelectMode)
+        DEFINE_STRINGIFY(InSelectInTableMode)
+        DEFINE_STRINGIFY(AfterBodyMode)
+        DEFINE_STRINGIFY(InFramesetMode)
+        DEFINE_STRINGIFY(AfterFramesetMode)
+        DEFINE_STRINGIFY(AfterAfterBodyMode)
+        DEFINE_STRINGIFY(AfterAfterFramesetMode)
+#undef DEFINE_STRINGIFY
+    }
+    return "<unknown>";
+}
+#endif
+
 } // namespace blink