Adds a pref and a policy to decide if PDFs should always be opened externally.

chrome/browser/ui/webui/options/content_settings_handler.cc

 // 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.
 
 #include "chrome/browser/ui/webui/options/content_settings_handler.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <map>
@@ skipping 487 matching lines @@
     {"backgroundSyncAllow", IDS_BACKGROUND_SYNC_ALLOW_RADIO},
     {"backgroundSyncBlock", IDS_BACKGROUND_SYNC_BLOCK_RADIO},
     // Zoom levels.
     {"zoomlevelsHeader", IDS_ZOOMLEVELS_HEADER_AND_TAB_LABEL},
     {"zoomLevelsManage", IDS_ZOOMLEVELS_MANAGE_BUTTON},
     // Keygen filter.
     {"keygenTabLabel", IDS_KEYGEN_TAB_LABEL},
     {"keygenHeader", IDS_KEYGEN_HEADER},
     {"keygenAllow", IDS_KEYGEN_ALLOW_RADIO},
     {"keygenBlock", IDS_KEYGEN_DONOTALLOW_RADIO},
+    // PDF Plugin filter.
+    {"pdfTabLabel", IDS_PDF_TAB_LABEL},
+    {"pdfHeader", IDS_PDF_HEADER},
+    {"pdfEnable", IDS_PDF_ENABLE_CHECKBOX},
   };
 
   RegisterStrings(localized_strings, resources, arraysize(resources));
 
   // TODO(tommycli): When the HTML5 By Default feature flag is on, we want to
   // display strings that begin with "Ask...", even though the setting remains
   // DETECT. Once this feature is finalized, then we migrate the setting to ASK.
   bool is_hbd = base::FeatureList::IsEnabled(features::kPreferHtmlOverPlugins);
   static OptionsStringResource flash_strings[] = {
       {"pluginsDetectImportantContent",
@@ skipping 997 matching lines @@
 
   // Exceptions apply only when the feature is enabled.
   PrefService* prefs = user_prefs::UserPrefs::Get(GetBrowserContext(web_ui()));
   bool enable_exceptions = prefs->GetBoolean(prefs::kEnableDRM);
   web_ui()->CallJavascriptFunctionUnsafe(
       "ContentSettings.enableProtectedContentExceptions",
       base::FundamentalValue(enable_exceptions));
 }
 
 }  // namespace options