Add isPromise V8 extras util

src/bootstrapper.cc

 // Copyright 2014 the V8 project 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 "src/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/api-natives.h"
 #include "src/base/ieee754.h"
 #include "src/code-stubs.h"
@@ skipping 4196 matching lines @@
   Handle<JSObject> extras_utils =
       factory()->NewJSObject(isolate()->object_function());
   native_context()->set_extras_utils_object(*extras_utils);
 
   InstallInternalArray(extras_utils, "InternalPackedArray", FAST_ELEMENTS);
 
   InstallFunction(extras_utils, isolate()->promise_internal_constructor(),
                   factory()->NewStringFromAsciiChecked("createPromise"));
   InstallFunction(extras_utils, isolate()->promise_resolve(),
                   factory()->NewStringFromAsciiChecked("resolvePromise"));
+  InstallFunction(extras_utils, isolate()->is_promise(),
+                  factory()->NewStringFromAsciiChecked("isPromise"));
 
   int builtin_index = Natives::GetDebuggerCount();
   // Only run prologue.js and runtime.js at this point.
   DCHECK_EQ(builtin_index, Natives::GetIndex("prologue"));
   if (!Bootstrapper::CompileBuiltin(isolate(), builtin_index++)) return false;
   DCHECK_EQ(builtin_index, Natives::GetIndex("runtime"));
   if (!Bootstrapper::CompileBuiltin(isolate(), builtin_index++)) return false;
 
   {
     // Builtin function for OpaqueReference -- a JSValue-based object,
@@ skipping 1054 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8