Split fpdfdoc/include/fpdf_doc.h into individual classes.

core/fpdfdoc/include/cpdf_occontext.h

Index: core/fpdfdoc/include/cpdf_occontext.h
diff --git a/core/fpdfdoc/include/cpdf_occontext.h b/core/fpdfdoc/include/cpdf_occontext.h
new file mode 100644
index 0000000000000000000000000000000000000000..38e81705e50c8dae85f3db8a3bd36eefff21495c
--- /dev/null
+++ b/core/fpdfdoc/include/cpdf_occontext.h
@@ -0,0 +1,42 @@
+// 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_INCLUDE_CPDF_OCCONTEXT_H_
+#define CORE_FPDFDOC_INCLUDE_CPDF_OCCONTEXT_H_
+
+#include <unordered_map>
+
+#include "core/fxcrt/include/fx_string.h"
+
+class CPDF_Array;
+class CPDF_Dictionary;
+class CPDF_Document;
+class CPDF_PageObject;
+
+class CPDF_OCContext {
+ public:
+  enum UsageType { View = 0, Design, Print, Export };
+
+  CPDF_OCContext(CPDF_Document* pDoc, UsageType eUsageType);
+  ~CPDF_OCContext();
+
+  bool CheckOCGVisible(const CPDF_Dictionary* pOCGDict);
+  bool CheckObjectVisible(const CPDF_PageObject* pObj);
+
+ private:
+  bool LoadOCGStateFromConfig(const CFX_ByteString& csConfig,
+                              const CPDF_Dictionary* pOCGDict) const;
+  bool LoadOCGState(const CPDF_Dictionary* pOCGDict) const;
+  bool GetOCGVisible(const CPDF_Dictionary* pOCGDict);
+  bool GetOCGVE(CPDF_Array* pExpression, int nLevel);
+  bool LoadOCMDState(const CPDF_Dictionary* pOCMDDict);
+
+  CPDF_Document* const m_pDocument;
+  const UsageType m_eUsageType;
+  std::unordered_map<const CPDF_Dictionary*, bool> m_OCGStates;
+};
+
+#endif  // CORE_FPDFDOC_INCLUDE_CPDF_OCCONTEXT_H_