Pdfium does not create isolate when it runs in chromium

fpdfsdk/src/fpdfxfa/fpdfxfa_app.cpp

Index: fpdfsdk/src/fpdfxfa/fpdfxfa_app.cpp
diff --git a/fpdfsdk/src/fpdfxfa/fpdfxfa_app.cpp b/fpdfsdk/src/fpdfxfa/fpdfxfa_app.cpp
index 44e9c72ddc09ad501105b34f4026c7e87c6d3208..1006bf9c440d265a0a752a3ab5f5fb9ee6960a9b 100644
--- a/fpdfsdk/src/fpdfxfa/fpdfxfa_app.cpp
+++ b/fpdfsdk/src/fpdfxfa/fpdfxfa_app.cpp
@@ -31,7 +31,8 @@ CPDFXFA_App::CPDFXFA_App()
       m_pXFAApp(NULL),
       m_pFontMgr(NULL),
       m_hJSERuntime(NULL),
-      m_csAppType(JS_STR_VIEWERTYPE_STANDARD) {
+      m_csAppType(JS_STR_VIEWERTYPE_STANDARD),
+      m_bOwnedRuntime(false) {
   m_pEnvList.RemoveAll();
 }
 
@@ -43,7 +44,7 @@ CPDFXFA_App::~CPDFXFA_App() {
   m_pXFAApp = NULL;
 
 #ifdef PDF_ENABLE_XFA
-  FXJSE_Runtime_Release(m_hJSERuntime);
+  FXJSE_Runtime_Release(m_hJSERuntime, m_bOwnedRuntime);
   m_hJSERuntime = NULL;
 
   FXJSE_Finalize();
@@ -51,12 +52,13 @@ CPDFXFA_App::~CPDFXFA_App() {
 #endif
 }
 
-FX_BOOL CPDFXFA_App::Initialize() {
+FX_BOOL CPDFXFA_App::Initialize(FXJSE_HRUNTIME hRuntime) {
 #ifdef PDF_ENABLE_XFA
   BC_Library_Init();
   FXJSE_Initialize();
 
-  m_hJSERuntime = FXJSE_Runtime_Create();
+  m_bOwnedRuntime = !hRuntime;
+  m_hJSERuntime = hRuntime ? hRuntime : FXJSE_Runtime_Create();
   if (!m_hJSERuntime)
     return FALSE;