Splitting fpdfdoc/doc_* part III.

core/fpdfdoc/cpdf_numbertree.h

Index: core/fpdfdoc/cpdf_numbertree.h
diff --git a/core/fpdfdoc/cpdf_numbertree.h b/core/fpdfdoc/cpdf_numbertree.h
new file mode 100644
index 0000000000000000000000000000000000000000..bfe44fddb9a58af2d0149d7aba91ddd5e20616ad
--- /dev/null
+++ b/core/fpdfdoc/cpdf_numbertree.h
@@ -0,0 +1,23 @@
+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef CORE_FPDFDOC_CPDF_NUMBERTREE_H_
+#define CORE_FPDFDOC_CPDF_NUMBERTREE_H_
+
+class CPDF_Dictionary;
+class CPDF_Object;
+
+class CPDF_NumberTree {
+ public:
+  explicit CPDF_NumberTree(CPDF_Dictionary* pRoot) : m_pRoot(pRoot) {}
+
+  CPDF_Object* LookupValue(int num) const;
+
+ protected:
+  CPDF_Dictionary* const m_pRoot;
+};
+
+#endif  // CORE_FPDFDOC_CPDF_NUMBERTREE_H_