[ESNext] Implement DynamicImportCall

src/d8.h

Index: src/d8.h
diff --git a/src/d8.h b/src/d8.h
index 21e4c4f0833c9f26da1b49813c1606d3d06351b5..d830a60a0c80697c69f47fc296baa51bb88ada8a 100644
--- a/src/d8.h
+++ b/src/d8.h
@@ -280,7 +280,6 @@ class Worker {
   base::Atomic32 running_;
 };
 
-
 class ShellOptions {
  public:
   ShellOptions()
@@ -440,7 +439,11 @@ class Shell : public i::AllStatic {
   static void SetUMask(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void MakeDirectory(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void RemoveDirectory(const v8::FunctionCallbackInfo<v8::Value>& args);
-
+  static void HostImportModuleDynamically(Isolate* isolate,
+                                          Local<String> source_url,
+                                          Local<String> specifier,
+                                          Local<Promise> promise);
+  static void DoHostImportModuleDynamically(void* data);
   static void AddOSMethods(v8::Isolate* isolate,
                            Local<ObjectTemplate> os_template);
 
@@ -482,6 +485,9 @@ class Shell : public i::AllStatic {
                            int index);
   static MaybeLocal<Module> FetchModuleTree(v8::Local<v8::Context> context,
                                             const std::string& file_name);
+  static MaybeLocal<Module> DynamicFetchModuleTree(
+      v8::Local<v8::Context> context, v8::Local<v8::Promise> promise,
+      const std::string& file_name);
 };