2016-03-02T18:53:01 LayoutPosition

third_party/WebKit/Source/core/editing/LayoutTreeTraversal.h

Index: third_party/WebKit/Source/core/editing/LayoutTreeTraversal.h
diff --git a/third_party/WebKit/Source/core/editing/LayoutTreeTraversal.h b/third_party/WebKit/Source/core/editing/LayoutTreeTraversal.h
new file mode 100644
index 0000000000000000000000000000000000000000..b6263c3449e83d9aae1c73e61596f3b719c307e7
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+++ b/third_party/WebKit/Source/core/editing/LayoutTreeTraversal.h
@@ -0,0 +1,43 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef LayoutTreeTraversal_h
+#define LayoutTreeTraversal_h
+
+#include "core/CoreExport.h"
+#include "core/editing/VisiblePosition.h"
+#include "wtf/Allocator.h"
+#include "wtf/Forward.h"
+
+namespace blink {
+
+// LayoutTreeTraversal is the layout tree version of |NodeTraversal|.
+class LayoutTreeTraversal final {
+    STATIC_ONLY(LayoutTreeTraversal);
+
+public:
+    static LayoutObject* parent(const LayoutObject&);
+    static LayoutObject* firstChild(const LayoutObject&);
+    static LayoutObject* lastChild(const LayoutObject&);
+    static bool hasChildren(const LayoutObject&);
+
+    static LayoutObject* nextSibling(const LayoutObject&);
+    static LayoutObject* previousSibling(const LayoutObject&);
+
+    static LayoutObject* next(const LayoutObject&);
+    static LayoutObject* previous(const LayoutObject&);
+};
+
+} // namespace blink
+
+#ifndef NDEBUG
+// Outside the blink namespace for ease of invocation from GDB.
+CORE_EXPORT void dumpLayoutTree(const blink::InlineBox*);
+CORE_EXPORT void dumpLayoutTree(const blink::LayoutObject*);
+CORE_EXPORT void dumpLayoutTree(const blink::Node*);
+CORE_EXPORT void dumpLayoutTree(const blink::Position&);
+CORE_EXPORT void dumpLayoutTree(const blink::VisiblePosition&);
+#endif
+
+#endif // LayoutTreeTraversal_h