[wasm] [asmjs] Route asm.js warnings to the dev console.

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/ast/ast.h"
 #include "src/base/bits.h"
@@ skipping 2277 matching lines @@
   Handle<JSMessageObject> message_obj = New<JSMessageObject>(map, NEW_SPACE);
   message_obj->set_properties(*empty_fixed_array(), SKIP_WRITE_BARRIER);
   message_obj->initialize_elements();
   message_obj->set_elements(*empty_fixed_array(), SKIP_WRITE_BARRIER);
   message_obj->set_type(message);
   message_obj->set_argument(*argument);
   message_obj->set_start_position(start_position);
   message_obj->set_end_position(end_position);
   message_obj->set_script(*script);
   message_obj->set_stack_frames(*stack_frames);
+  message_obj->set_error_level(v8::Isolate::kMessageError);
   return message_obj;
 }
 
 
 Handle<SharedFunctionInfo> Factory::NewSharedFunctionInfo(
     Handle<String> name, MaybeHandle<Code> maybe_code, bool is_constructor) {
   // Function names are assumed to be flat elsewhere. Must flatten before
   // allocating SharedFunctionInfo to avoid GC seeing the uninitialized SFI.
   name = String::Flatten(name, TENURED);
 
@@ skipping 470 matching lines @@
       Handle<JSFixedArrayIterator>::cast(NewJSObjectFromMap(map));
   iterator->set_initial_next(*next);
   iterator->set_array(*array);
   iterator->set_index(0);
   iterator->InObjectPropertyAtPut(JSFixedArrayIterator::kNextIndex, *next);
   return iterator;
 }
 
 }  // namespace internal
 }  // namespace v8