[proxies] Add all-can-read/String/Symbol filtering support to GetKeys()

src/key-accumulator.cc

 // Copyright 2013 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/key-accumulator.h"
 
 #include "src/elements.h"
 #include "src/factory.h"
 #include "src/isolate-inl.h"
 #include "src/objects-inl.h"
@@ skipping 85 matching lines @@
   return AddKey(handle(key, isolate_), convert);
 }
 
 
 bool KeyAccumulator::AddKey(Handle<Object> key, AddKeyConversion convert) {
   if (key->IsSymbol()) {
     if (filter_ & SKIP_SYMBOLS) return false;
     if (Handle<Symbol>::cast(key)->is_private()) return false;
     return AddSymbolKey(key);
   }
+  if (filter_ & SKIP_STRINGS) return false;
   // Make sure we do not add keys to a proxy-level (see AddKeysFromProxy).
   DCHECK_LE(0, level_string_length_);
   // In some cases (e.g. proxies) we might get in String-converted ints which
   // should be added to the elements list instead of the properties. For
   // proxies we have to convert as well but also respect the original order.
   // Therefore we add a converted key to both sides
   if (convert == CONVERT_TO_ARRAY_INDEX || convert == PROXY_MAGIC) {
     uint32_t index = 0;
     int prev_length = length_;
     int prev_proto = level_string_length_;
@@ skipping 112 matching lines @@
     return keys;
   }
   int store_position = 0;
   for (int i = 0; i < keys->length(); ++i) {
     Handle<Name> key(Name::cast(keys->get(i)), isolate);
     if (key->IsSymbol()) {
       if ((filter & SKIP_SYMBOLS) || Handle<Symbol>::cast(key)->is_private()) {
         continue;  // Skip this key.
       }
     }
+    if (filter & SKIP_STRINGS) continue;  // Skip this key.
     if (filter & ONLY_ENUMERABLE) {
       PropertyDescriptor desc;
       bool found =
           JSProxy::GetOwnPropertyDescriptor(isolate, owner, key, &desc);
       if (isolate->has_pending_exception()) return MaybeHandle<FixedArray>();
       if (!found || !desc.enumerable()) continue;  // Skip this key.
     }
     // Keep this key.
     if (store_position != i) {
       keys->set(store_position, *key);
@@ skipping 60 matching lines @@
     level_lengths_.push_back(level_symbol_length_);
   }
   elements_.push_back(new std::vector<uint32_t>());
   level_string_length_ = 0;
   level_symbol_length_ = 0;
 }
 
 
 }  // namespace internal
 }  // namespace v8