Merge to XFA: Wean CJS_Value off of v8::Isolate.

(cherry picked from commit 287b63d9ab410783d71cf37291f09fd57d3059b4)
Original Review URL: https://codereview.chromium.org/1394103002 .

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1394053003 .
diff --git a/fpdfsdk/src/javascript/JS_Runtime.cpp b/fpdfsdk/src/javascript/JS_Runtime.cpp
index a449a14..d01c1fa 100644
--- a/fpdfsdk/src/javascript/JS_Runtime.cpp
+++ b/fpdfsdk/src/javascript/JS_Runtime.cpp
@@ -32,10 +32,17 @@
 /* ------------------------------ CJS_Runtime ------------------------------ */
 v8::Global<v8::ObjectTemplate>& _getGlobalObjectTemplate(v8::Isolate* pIsolate);
 
+// static
 IJS_Runtime* IJS_Runtime::Create(CPDFDoc_Environment* pEnv) {
   return new CJS_Runtime(pEnv);
 }
 
+// static
+CJS_Runtime* CJS_Runtime::FromContext(const IJS_Context* cc) {
+  const CJS_Context* pContext = static_cast<const CJS_Context*>(cc);
+  return pContext->GetJSRuntime();
+}
+
 CJS_Runtime::CJS_Runtime(CPDFDoc_Environment* pApp)
     : m_pApp(pApp),
       m_pDocument(NULL),
@@ -139,8 +146,8 @@
 
   // ObjDefIDs 18 - 20 (these can't fail, return void).
   CJS_PublicMethods::DefineJSObjects(GetIsolate());
-  CJS_GlobalConsts::DefineJSObjects(GetIsolate());
-  CJS_GlobalArrays::DefineJSObjects(GetIsolate());
+  CJS_GlobalConsts::DefineJSObjects(this);
+  CJS_GlobalArrays::DefineJSObjects(this);
 
   // ObjDefIDs 21 - 22.
   CJS_TimerObj::DefineJSObjects(GetIsolate(), FXJSOBJTYPE_DYNAMIC);