Allow the PDF extension for chrome://print pages.

content/browser/webui/web_ui_data_source_impl.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_WEBUI_WEB_UI_DATA_SOURCE_IMPL_H_
 #define CONTENT_BROWSER_WEBUI_WEB_UI_DATA_SOURCE_IMPL_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 27 matching lines @@
       const base::DictionaryValue& localized_strings) override;
   void AddBoolean(const std::string& name, bool value) override;
   void AddInteger(const std::string& name, int32_t value) override;
   void SetJsonPath(const std::string& path) override;
   void AddResourcePath(const std::string& path, int resource_id) override;
   void SetDefaultResource(int resource_id) override;
   void SetRequestFilter(
       const WebUIDataSource::HandleRequestCallback& callback) override;
   void DisableReplaceExistingSource() override;
   void DisableContentSecurityPolicy() override;
+  void OverrideContentSecurityPolicyScriptSrc(const std::string& data) override;
   void OverrideContentSecurityPolicyObjectSrc(const std::string& data) override;
   void OverrideContentSecurityPolicyChildSrc(const std::string& data) override;
   void DisableDenyXFrameOptions() override;
   void DisableI18nAndUseGzipForAllPaths() override;
 
   // When DisableI18nAndUseGzipForAllPaths is enabled, exclude the given |path|.
   void ExcludePathFromGzip(const std::string& path);
 
  protected:
   ~WebUIDataSourceImpl() override;
@@ skipping 32 matching lines @@
   std::string json_path_;
   std::map<std::string, int> path_to_idr_map_;
   std::unordered_set<std::string> excluded_paths_;
   // The |replacements_| is intended to replace |localized_strings_|.
   // TODO(dschuyler): phase out |localized_strings_| in Q1 2016. (Or rename
   // to |load_time_flags_| if the usage is reduced to storing flags only).
   ui::TemplateReplacements replacements_;
   base::DictionaryValue localized_strings_;
   WebUIDataSource::HandleRequestCallback filter_callback_;
   bool add_csp_;
+  bool script_src_set_;
+  std::string script_src_;
   bool object_src_set_;
   std::string object_src_;
   bool frame_src_set_;
   std::string frame_src_;
   bool deny_xframe_options_;
   bool add_load_time_data_defaults_;
   bool replace_existing_source_;
   bool use_gzip_for_all_paths_;
 
   DISALLOW_COPY_AND_ASSIGN(WebUIDataSourceImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEBUI_WEB_UI_DATA_SOURCE_IMPL_H_