[Extensions Bindings] Add a bridge to use current custom bindings

extensions/renderer/argument_spec.cc

 // Copyright 2016 The Chromium 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 "extensions/renderer/argument_spec.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/values.h"
 #include "content/public/child/v8_value_converter.h"
 #include "gin/converter.h"
@@ skipping 29 matching lines @@
 }
 
 void ArgumentSpec::InitializeType(const base::DictionaryValue* dict) {
   std::string ref_string;
   if (dict->GetString("$ref", &ref_string)) {
     ref_ = std::move(ref_string);
     type_ = ArgumentType::REF;
     return;
   }
 
+  {
+    const base::ListValue* choices = nullptr;
+    if (dict->GetList("choices", &choices)) {
+      // TODO(devlin): Properly handle choices.
+      type_ = ArgumentType::ANY;
+      return;
+    }
+  }
+
   std::string type_string;
   CHECK(dict->GetString("type", &type_string));
   if (type_string == "integer")
     type_ = ArgumentType::INTEGER;
   else if (type_string == "number")
     type_ = ArgumentType::DOUBLE;
   else if (type_string == "object")
     type_ = ArgumentType::OBJECT;
   else if (type_string == "array")
     type_ = ArgumentType::LIST;
@@ skipping 204 matching lines @@
   std::unique_ptr<content::V8ValueConverter> converter(
       content::V8ValueConverter::create());
   std::unique_ptr<base::Value> converted(
       converter->FromV8Value(value, context));
   if (!converted)
     *error = "Could not convert to 'any'.";
   return converted;
 }
 
 }  // namespace extensions