Avoid cross-origin iframe issues when loading PDF in print preview

chrome/browser/ui/webui/print_preview/print_preview_ui.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/print_preview/print_preview_ui.h"
 
 #include <map>
 #include <vector>
 
 #include "base/id_map.h"
@@ skipping 345 matching lines @@
   source->AddLocalizedString(
       "acceptForGroup", IDS_PRINT_PREVIEW_ACCEPT_GROUP_INVITE);
   source->AddLocalizedString("reject", IDS_PRINT_PREVIEW_REJECT_INVITE);
   source->AddLocalizedString(
       "groupPrinterSharingInviteText", IDS_PRINT_PREVIEW_GROUP_INVITE_TEXT);
   source->AddLocalizedString(
       "printerSharingInviteText", IDS_PRINT_PREVIEW_INVITE_TEXT);
 
   source->SetJsonPath("strings.js");
   source->AddResourcePath("print_preview.js", IDR_PRINT_PREVIEW_JS);
+  source->AddResourcePath("pdf_preview.html",
+                          IDR_PRINT_PREVIEW_PDF_PREVIEW_HTML);
   source->AddResourcePath("images/printer.png",
                           IDR_PRINT_PREVIEW_IMAGES_PRINTER);
   source->AddResourcePath("images/printer_shared.png",
                           IDR_PRINT_PREVIEW_IMAGES_PRINTER_SHARED);
   source->AddResourcePath("images/third_party.png",
                           IDR_PRINT_PREVIEW_IMAGES_THIRD_PARTY);
   source->AddResourcePath("images/third_party_fedex.png",
                           IDR_PRINT_PREVIEW_IMAGES_THIRD_PARTY_FEDEX);
   source->AddResourcePath("images/google_doc.png",
                           IDR_PRINT_PREVIEW_IMAGES_GOOGLE_DOC);
   source->AddResourcePath("images/pdf.png", IDR_PRINT_PREVIEW_IMAGES_PDF);
   source->AddResourcePath("images/mobile.png", IDR_PRINT_PREVIEW_IMAGES_MOBILE);
   source->AddResourcePath("images/mobile_shared.png",
                           IDR_PRINT_PREVIEW_IMAGES_MOBILE_SHARED);
   source->SetDefaultResource(IDR_PRINT_PREVIEW_HTML);
   source->SetRequestFilter(base::Bind(&HandleRequestCallback));
+  source->OverrideContentSecurityPolicyFrameSrc("frame-src 'self';");
+  source->DisableDenyXFrameOptions();
   source->OverrideContentSecurityPolicyObjectSrc("object-src 'self';");
   source->AddLocalizedString("moreOptionsLabel", IDS_MORE_OPTIONS_LABEL);
   source->AddLocalizedString("lessOptionsLabel", IDS_LESS_OPTIONS_LABEL);
   return source;
 }
 
 PrintPreviewUI::TestingDelegate* g_testing_delegate = NULL;
 
 }  // namespace
 
@@ skipping 262 matching lines @@
 }
 
 void PrintPreviewUI::SetSelectedFileForTesting(const base::FilePath& path) {
   handler_->FileSelected(path, 0, NULL);
 }
 
 void PrintPreviewUI::SetPdfSavedClosureForTesting(
     const base::Closure& closure) {
   handler_->SetPdfSavedClosureForTesting(closure);
 }