Add Isolate::DiscardThreadSpecificMetadata method to embedder API.

src/api.cc

 // Copyright 2012 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/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 7144 matching lines @@
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   if (!Utils::ApiCheck(!isolate->IsInUse(),
                        "v8::Isolate::Dispose()",
                        "Disposing the isolate that is entered by a thread.")) {
     return;
   }
   isolate->TearDown();
 }
 
 
+void Isolate::DiscardThreadSpecificMetadata() {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  isolate->DiscardPerThreadDataForThisThread();
+}
+
+
 void Isolate::Enter() {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   isolate->Enter();
 }
 
 
 void Isolate::Exit() {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   isolate->Exit();
 }
@@ skipping 1311 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8