[wasm] Enable content policy for wasm compilation.

src/wasm/wasm-module.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <memory>
 
 #include "src/assembler-inl.h"
 #include "src/base/adapters.h"
 #include "src/base/atomic-utils.h"
 #include "src/code-stubs.h"
@@ skipping 2165 matching lines @@
 bool wasm::IsWasmInstance(Object* object) {
   return WasmInstanceObject::IsWasmInstanceObject(object);
 }
 
 Handle<Script> wasm::GetScript(Handle<JSObject> instance) {
   WasmCompiledModule* compiled_module =
       WasmInstanceObject::cast(*instance)->compiled_module();
   return handle(compiled_module->script());
 }
 
+bool wasm::IsWasmCodegenAllowed(Isolate* isolate, Handle<Context> context) {
+  return isolate->allow_code_gen_callback() == nullptr ||
+         isolate->allow_code_gen_callback()(v8::Utils::ToLocal(context));
+}
+
 // TODO(clemensh): origin can be inferred from asm_js_script; remove it.
 MaybeHandle<WasmModuleObject> wasm::CreateModuleObjectFromBytes(
     Isolate* isolate, const byte* start, const byte* end, ErrorThrower* thrower,
     ModuleOrigin origin, Handle<Script> asm_js_script,
     Vector<const byte> asm_js_offset_table_bytes) {
   MaybeHandle<WasmModuleObject> nothing;
+
+  if (!IsWasmCodegenAllowed(isolate, isolate->native_context())) {
+    thrower->CompileError("Wasm code generation disallowed in this context");
+    return nothing;
+  }
+
   ModuleResult result = DecodeWasmModule(isolate, start, end, false, origin);
   if (result.failed()) {
     if (result.val) delete result.val;
     thrower->CompileFailed("Wasm decoding failed", result);
     return nothing;
   }
 
   // The {module_wrapper} will take ownership of the {WasmModule} object,
   // and it will be destroyed when the GC reclaims the wrapper object.
   Handle<WasmModuleWrapper> module_wrapper =
@@ skipping 426 matching lines @@
 
     JSObject::AddProperty(entry, name_string, export_name.ToHandleChecked(),
                           NONE);
     JSObject::AddProperty(entry, kind_string, export_kind, NONE);
 
     storage->set(index, *entry);
   }
 
   return array_object;
 }