Add export annotation to fix component build

src/isolate.h

 // 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.
 
 #ifndef V8_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <memory>
 #include <queue>
 
@@ skipping 232 matching lines @@
   // (required for public API: V8::V8::TerminateExecution).
   static ThreadId FromInteger(int id) { return ThreadId(id); }
 
  private:
   static const int kInvalidId = -1;
 
   explicit ThreadId(int id) { base::NoBarrier_Store(&id_, id); }
 
   static int AllocateThreadId();
 
-  static int GetCurrentThreadId();
+  V8_EXPORT_PRIVATE static int GetCurrentThreadId();
 
   base::Atomic32 id_;
 
   static base::Atomic32 highest_thread_id_;
 
   friend class Isolate;
 };
 
 
 #define FIELD_ACCESSOR(type, name)                 \
@@ skipping 1419 matching lines @@
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ISOLATE_H_