Non-tree-shaking --precompile.

runtime/vm/native_api_impl.cc

Index: runtime/vm/native_api_impl.cc
diff --git a/runtime/vm/native_api_impl.cc b/runtime/vm/native_api_impl.cc
index a3cd5c1a702822a7335e8989fb22987a10243da5..a6688976e9924ee175f08f01754ad6959514374d 100644
--- a/runtime/vm/native_api_impl.cc
+++ b/runtime/vm/native_api_impl.cc
@@ -11,6 +11,7 @@
 #include "vm/message.h"
 #include "vm/native_message_handler.h"
 #include "vm/port.h"
+#include "vm/precompiler.h"
 
 namespace dart {
 
@@ -79,6 +80,16 @@ static void CompileAll(Isolate* isolate, Dart_Handle* result) {
   }
 }
 
+static void Precompile(Isolate* isolate, Dart_Handle* result) {
+  ASSERT(isolate != NULL);
+  const Error& error = Error::Handle(isolate, Precompiler::CompileAll());
+  if (error.IsNull()) {
+    *result = Api::Success();
+  } else {
+    *result = Api::NewHandle(isolate, error.raw());
+  }
+}
+
 
 DART_EXPORT Dart_Handle Dart_CompileAll() {
   Isolate* isolate = Isolate::Current();
@@ -92,4 +103,17 @@ DART_EXPORT Dart_Handle Dart_CompileAll() {
   return result;
 }
 
+
+DART_EXPORT Dart_Handle Dart_Precompile() {
+  Isolate* isolate = Isolate::Current();
+  DARTSCOPE(isolate);
+  Dart_Handle result = Api::CheckAndFinalizePendingClasses(isolate);
+  if (::Dart_IsError(result)) {
+    return result;
+  }
+  CHECK_CALLBACK_STATE(isolate);
+  Precompile(isolate, &result);
+  return result;
+}
+
 }  // namespace dart