[platform] Implement a worker pool

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index aee9e3a469eae454a9fdc7b241142050044a730a..42a003d8ade7c504f107a7ada824d111fc539a31 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -47,6 +47,9 @@
 #include "heap-snapshot-generator-inl.h"
 #include "icu_util.h"
 #include "json-parser.h"
+#ifdef V8_USE_DEFAULT_PLATFORM
+#include "libplatform/default-platform.h"
+#endif
 #include "messages.h"
 #ifdef COMPRESS_STARTUP_DATA_BZ2
 #include "natives.h"
@@ -630,6 +633,11 @@ bool SetResourceConstraints(Isolate* v8_isolate,
   }
 
   isolate->set_max_available_threads(constraints->max_available_threads());
+
+#ifdef V8_USE_DEFAULT_PLATFORM
+  i::DefaultPlatform::SetThreadPoolSize(constraints->max_available_threads());
+#endif
+
   return true;
 }