[wasm] Support a two-level namespace for imports.

test/cctest/wasm/test-run-wasm-js.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 <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "src/wasm/wasm-macro-gen.h"
@@ skipping 39 matching lines @@
 
 
 uint32_t AddJsFunction(TestingModule* module, FunctionSig* sig,
                        const char* source) {
   Handle<JSFunction> jsfunc = Handle<JSFunction>::cast(v8::Utils::OpenHandle(
       *v8::Local<v8::Function>::Cast(CompileRun(source))));
   module->AddFunction(sig, Handle<Code>::null());
   uint32_t index = static_cast<uint32_t>(module->module->functions.size() - 1);
   Isolate* isolate = CcTest::InitIsolateOnce();
   Handle<Code> code =
-      CompileWasmToJSWrapper(isolate, module, jsfunc, sig, "test");
+      CompileWasmToJSWrapper(isolate, module, jsfunc, sig, "test", nullptr);
   module->instance->function_code[index] = code;
   return index;
 }
 
 
 uint32_t AddJSSelector(TestingModule* module, FunctionSig* sig, int which) {
   const int kMaxParams = 8;
   static const char* formals[kMaxParams] = {
       "",        "a",         "a,b",         "a,b,c",
       "a,b,c,d", "a,b,c,d,e", "a,b,c,d,e,f", "a,b,c,d,e,f,g",
@@ skipping 352 matching lines @@
   RunJSSelectAlignTest(1, 2);
   RunJSSelectAlignTest(1, 3);
 }
 
 
 TEST(Run_JSSelectAlign_3) {
   RunJSSelectAlignTest(3, 3);
   RunJSSelectAlignTest(3, 4);
 }
 #endif