Add test to ensure that URLs that redirect inside the PDF plugin fail to load

pdf/pdfium/pdfium_engine.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 "pdf/pdfium/pdfium_engine.h"
 
 #include <math.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 1076 matching lines @@
       fpdf_availability_ = FPDFAvail_Create(&file_availability_, &file_access_);
       DCHECK(fpdf_availability_);
     }
     LoadDocument();
     return;
   }
 
   FinishLoadingDocument();
 }
 
+void PDFiumEngine::DocumentLoadFailed() {
+  client_->DocumentLoadFailed();
+}
+
 void PDFiumEngine::FinishLoadingDocument() {
   DCHECK(doc_loader_.IsDocumentComplete() && doc_);
 
   bool need_update = false;
   for (size_t i = 0; i < pages_.size(); ++i) {
     if (pages_[i]->available())
       continue;
 
     pages_[i]->set_available(true);
     // We still need to call IsPageAvail() even if the whole document is
@@ skipping 2899 matching lines @@
   FPDF_DOCUMENT doc =
       FPDF_LoadMemDocument(pdf_buffer, pdf_buffer_size, nullptr);
   if (!doc)
     return false;
   bool success = FPDF_GetPageSizeByIndex(doc, page_number, width, height) != 0;
   FPDF_CloseDocument(doc);
   return success;
 }
 
 }  // namespace chrome_pdf