[modules] Implement namespace imports.

src/factory.cc

 // Copyright 2014 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/factory.h"
 
 #include "src/accessors.h"
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 1717 matching lines @@
     } else {
       DCHECK(mode == INITIALIZE_ARRAY_ELEMENTS_WITH_HOLE);
       elms = NewFixedArrayWithHoles(capacity);
     }
   }
 
   array->set_elements(*elms);
   array->set_length(Smi::FromInt(length));
 }
 
+Handle<JSModuleNamespace> Factory::NewJSModuleNamespace() {
+  Handle<Map> map = isolate()->js_module_namespace_map();
+  return Handle<JSModuleNamespace>::cast(NewJSObjectFromMap(map));
+}
 
 Handle<JSGeneratorObject> Factory::NewJSGeneratorObject(
     Handle<JSFunction> function) {
   DCHECK(IsResumableFunction(function->shared()->kind()));
   JSFunction::EnsureHasInitialMap(function);
   Handle<Map> map(function->initial_map());
   DCHECK_EQ(JS_GENERATOR_OBJECT_TYPE, map->instance_type());
   CALL_HEAP_FUNCTION(
       isolate(),
       isolate()->heap()->AllocateJSObjectFromMap(*map),
@@ skipping 855 matching lines @@
     Handle<AccessorInfo> prototype =
         Accessors::FunctionPrototypeInfo(isolate(), attribs);
     AccessorConstantDescriptor d(Handle<Name>(Name::cast(prototype->name())),
                                  prototype, attribs);
     map->AppendDescriptor(&d);
   }
 }
 
 }  // namespace internal
 }  // namespace v8