[wasm] Be more lenient on the names section.

src/wasm/wasm-module-builder.cc

Index: src/wasm/wasm-module-builder.cc
diff --git a/src/wasm/wasm-module-builder.cc b/src/wasm/wasm-module-builder.cc
index eaa3451e3f9a5238351feeb9502298ba7324db96..290e98ecf8c224bb68f132669230541f23e4565b 100644
--- a/src/wasm/wasm-module-builder.cc
+++ b/src/wasm/wasm-module-builder.cc
@@ -509,7 +509,12 @@ void WasmModuleBuilder::WriteTo(ZoneBuffer& buffer) const {
     buffer.write_size(4);
     buffer.write(reinterpret_cast<const byte*>("name"), 4);
     // Emit the names.
-    buffer.write_size(functions_.size());
+    size_t count = functions_.size() + imports_.size();
+    buffer.write_size(count);
+    for (size_t i = 0; i < imports_.size(); i++) {
+      buffer.write_u8(0);  // empty name for import
+      buffer.write_u8(0);  // no local variables
+    }
     for (auto function : functions_) {
       buffer.write_size(function->name_.size());
       if (function->name_.size() > 0) {