[wasm] Embedder can control what buffers wasm compilation works on.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 9a7283ff4ce3f0e96f6d5954c9a89982236a35f1..cc393555063da85db49be2c9e2837bf68ccfeb48 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -8707,6 +8707,16 @@ void Isolate::SetAllowCodeGenerationFromStringsCallback(
   isolate->set_allow_code_gen_callback(callback);
 }
 
+void Isolate::SetAllowWasmCompileCallback(AllowWasmCompileCallback callback) {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  isolate->set_allow_wasm_compile_callback(callback);
+}
+
+void Isolate::SetAllowWasmInstantiateCallback(
+    AllowWasmInstantiateCallback callback) {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  isolate->set_allow_wasm_instantiate_callback(callback);
+}
 
 bool Isolate::IsDead() {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);