Let the embedder provide entry points to Dart_Precompile.

runtime/include/dart_api.h

Index: runtime/include/dart_api.h
diff --git a/runtime/include/dart_api.h b/runtime/include/dart_api.h
index 9042eff1575d621e354c3bb8e710b8ab2f5addd9..cf7f9e166077bb5071599d4c1bdafe539d623185 100755
--- a/runtime/include/dart_api.h
+++ b/runtime/include/dart_api.h
@@ -2870,7 +2870,17 @@ DART_EXPORT Dart_Port Dart_ServiceWaitForLoadPort();
  */
 
 
-DART_EXPORT Dart_Handle Dart_Precompile();
+typedef struct {
+  const char* library_uri;
+  const char* class_name;
+  const char* function_name;
+} Dart_QualifiedFunctionName;
+
+
+DART_EXPORT Dart_Handle Dart_Precompile(
+    Dart_QualifiedFunctionName* entry_points);
+
+
 DART_EXPORT Dart_Handle Dart_CreatePrecompiledSnapshot(
     uint8_t** vm_isolate_snapshot_buffer,
     intptr_t* vm_isolate_snapshot_size,