Set V8 extras mode in gin::V8Initializer.

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 "base/i18n/icu_encoding_detection.h"
 #include "base/i18n/icu_string_conversions.h"
@@ skipping 437 matching lines @@
       &value, size, false);
   string_adapter.Close(
       FPDF_GetMetaText(doc, key.c_str(), string_adapter.GetData(), size));
   return base::UTF16ToUTF8(value);
 }
 
 gin::IsolateHolder* g_isolate_holder = nullptr;
 
 void SetUpV8() {
   gin::IsolateHolder::Initialize(gin::IsolateHolder::kNonStrictMode,
+                                 gin::IsolateHolder::kStableV8Extras,
                                  gin::ArrayBufferAllocator::SharedInstance());
   g_isolate_holder =
       new gin::IsolateHolder(gin::IsolateHolder::kSingleThread);
   g_isolate_holder->isolate()->Enter();
 }
 
 void TearDownV8() {
   g_isolate_holder->isolate()->Exit();
   delete g_isolate_holder;
   g_isolate_holder = nullptr;
@@ skipping 3526 matching lines @@
     double* height) {
   FPDF_DOCUMENT doc = FPDF_LoadMemDocument(pdf_buffer, pdf_buffer_size, NULL);
   if (!doc)
     return false;
   bool success = FPDF_GetPageSizeByIndex(doc, page_number, width, height) != 0;
   FPDF_CloseDocument(doc);
   return success;
 }
 
 }  // namespace chrome_pdf