[wasm] Implement correct 2-level namespace for imports.

src/wasm/wasm-module-builder.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 "src/signature.h"
 
 #include "src/handles.h"
 #include "src/v8.h"
 #include "src/zone/zone-containers.h"
 
@@ skipping 310 matching lines @@
       }
     }
     FixupSection(buffer, start);
   }
 
   // == Emit imports ===========================================================
   if (imports_.size() > 0) {
     size_t start = EmitSection(kImportSectionCode, buffer);
     buffer.write_size(imports_.size());
     for (auto import : imports_) {
-      buffer.write_u32v(import.name_length);  // module name length
-      buffer.write(reinterpret_cast<const byte*>(import.name),  // module name
+      buffer.write_u32v(0);                   // module name length
+      buffer.write_u32v(import.name_length);  // field name length
+      buffer.write(reinterpret_cast<const byte*>(import.name),  // field name
                    import.name_length);
-      buffer.write_u32v(0);  // field name length
       buffer.write_u8(kExternalFunction);
       buffer.write_u32v(import.sig_index);
     }
     FixupSection(buffer, start);
   }
 
   // == Emit function signatures ===============================================
   bool has_names = false;
   if (functions_.size() > 0) {
     size_t start = EmitSection(kFunctionSectionCode, buffer);
@@ skipping 190 matching lines @@
   // Emit the offset table per function.
   for (auto function : functions_) {
     function->WriteAsmWasmOffsetTable(buffer);
   }
   // Append a 0 to indicate that this is an encoded table.
   buffer.write_u8(0);
 }
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8