Make code compile with clang_use_chrome_plugin (part I)

core/fpdfapi/fpdf_page/cpdf_contentmarkdata.cpp

 // 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
 
 #include "core/fpdfapi/fpdf_page/cpdf_contentmarkdata.h"
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h"
 #include "third_party/base/stl_util.h"
 
+CPDF_ContentMarkData::CPDF_ContentMarkData() {}
+
 CPDF_ContentMarkData::CPDF_ContentMarkData(const CPDF_ContentMarkData& src)
     : m_Marks(src.m_Marks) {}
 
+CPDF_ContentMarkData::~CPDF_ContentMarkData() {}
+
 int CPDF_ContentMarkData::CountItems() const {
   return pdfium::CollectionSize<int>(m_Marks);
 }
 
+CPDF_ContentMarkItem& CPDF_ContentMarkData::GetItem(int index) {
+  return m_Marks[index];
+}
+
+const CPDF_ContentMarkItem& CPDF_ContentMarkData::GetItem(int index) const {
+  return m_Marks[index];
+}
+
 int CPDF_ContentMarkData::GetMCID() const {
   for (const auto& mark : m_Marks) {
     CPDF_ContentMarkItem::ParamType type = mark.GetParamType();
     if (type == CPDF_ContentMarkItem::PropertiesDict ||
         type == CPDF_ContentMarkItem::DirectDict) {
       CPDF_Dictionary* pDict = mark.GetParam();
       if (pDict->KeyExist("MCID"))
         return pDict->GetIntegerBy("MCID");
     }
   }
@@ skipping 13 matching lines @@
       item.SetParam(CPDF_ContentMarkItem::PropertiesDict, pDict);
     }
   }
   m_Marks.push_back(item);
 }
 
 void CPDF_ContentMarkData::DeleteLastMark() {
   if (!m_Marks.empty())
     m_Marks.pop_back();
 }