Move microtask queueing logic from JavaScript to C++

src/execution.h

 // 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.
 
 #ifndef V8_EXECUTION_H_
 #define V8_EXECUTION_H_
 
 #include "handles.h"
 
 namespace v8 {
@@ skipping 103 matching lines @@
   MUST_USE_RESULT static MaybeHandle<Object> TryGetFunctionDelegate(
       Isolate* isolate,
       Handle<Object> object);
 
   // Get a function delegate (or undefined) for the given non-function
   // object. Used for support calling objects as constructors.
   static Handle<Object> GetConstructorDelegate(Isolate* isolate,
                                                Handle<Object> object);
   static MaybeHandle<Object> TryGetConstructorDelegate(Isolate* isolate,
                                                        Handle<Object> object);
-
-  static void RunMicrotasks(Isolate* isolate);
-  static void EnqueueMicrotask(Isolate* isolate, Handle<Object> microtask);
 };
 
 
 class ExecutionAccess;
 
 
 // StackGuard contains the handling of the limits that are used to limit the
 // number of nested invocations of JavaScript and the stack size used in each
 // invocation.
 class StackGuard V8_FINAL {
@@ skipping 144 matching lines @@
   friend class Isolate;
   friend class StackLimitCheck;
   friend class PostponeInterruptsScope;
 
   DISALLOW_COPY_AND_ASSIGN(StackGuard);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_EXECUTION_H_