Turn libplatform into a component

src/libplatform/task-queue.h

Index: src/libplatform/task-queue.h
diff --git a/src/libplatform/task-queue.h b/src/libplatform/task-queue.h
index 5239cdac401d525773efd5c36380409776d07825..330527a09e6b31549cdfec0c102a35f70cb4fade 100644
--- a/src/libplatform/task-queue.h
+++ b/src/libplatform/task-queue.h
@@ -7,6 +7,7 @@
 
 #include <queue>
 
+#include "include/libplatform/libplatform-export.h"
 #include "src/base/macros.h"
 #include "src/base/platform/mutex.h"
 #include "src/base/platform/semaphore.h"
@@ -18,7 +19,7 @@ class Task;
 
 namespace platform {
 
-class TaskQueue {
+class V8_PLATFORM_EXPORT TaskQueue {
  public:
   TaskQueue();
   ~TaskQueue();