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

test/inspector/debugger/wasm-source.js

 // Copyright 2016 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.
 
 // Flags: --expose-wasm
 
 load('test/mjsunit/wasm/wasm-constants.js');
 load('test/mjsunit/wasm/wasm-module-builder.js');
 
 var builder = new WasmModuleBuilder();
 
-var imported_idx = builder.addImport("func", kSig_v_v);
+var imported_idx = builder.addImport("xxx", "func", kSig_v_v);
 
 var call_imported_idx = builder.addFunction("call_func", kSig_v_v)
     .addBody([kExprCallFunction, imported_idx])
     .index;
 
 var sig_index = builder.addType(kSig_v_v);
 
 builder.addFunction('main', kSig_v_v)
     .addBody([
       kExprBlock, kAstStmt, kExprI32Const, 0, kExprCallIndirect, sig_index,
@@ skipping 10 matching lines @@
     debugger;
   }
 
   var buffer = new ArrayBuffer(bytes.length);
   var view = new Uint8Array(buffer);
   for (var i = 0; i < bytes.length; i++) {
     view[i] = bytes[i] | 0;
   }
 
   var module = new WebAssembly.Module(buffer);
-  var instance = new WebAssembly.Instance(module, {func: call_debugger});
+  var instance = new WebAssembly.Instance(module, {xxx: {func: call_debugger}});
 
   instance.exports.main();
 }
 
 InspectorTest.addScript(testFunction.toString());
 InspectorTest.addScript('var module_bytes = ' + JSON.stringify(module_bytes));
 
 Protocol.Debugger.enable();
 Protocol.Debugger.onPaused(handleDebuggerPaused);
 InspectorTest.log('Check that inspector gets disassembled wasm code');
@@ skipping 16 matching lines @@
         .getScriptSource({scriptId: frames[frameId].location.scriptId})
         .then(dumpSourceLine.bind(null, frameId))
         .then(() => next(frameId + 1));
   }
   function finished() {
     InspectorTest.log('Finished.');
     InspectorTest.completeTest();
   }
   next(0).then(finished);
 }