Allow extension APIs to be called from WebUI.

extensions/common/extension_api.cc

 // Copyright 2013 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/common/extension_api.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 285 matching lines @@
              .is_available() ||
          IsAvailable(
              name, extension, Feature::UNBLESSED_EXTENSION_CONTEXT, GURL())
              .is_available() ||
          IsAvailable(name, extension, Feature::BLESSED_WEB_PAGE_CONTEXT, GURL())
              .is_available() ||
          IsAvailable(name, extension, Feature::WEB_PAGE_CONTEXT, GURL())
              .is_available();
 }
 
+bool ExtensionAPI::IsAvailableToWebUI(const std::string& name) {
+  return IsAvailable(name, NULL, Feature::WEBUI_CONTEXT, GURL()).is_available();
+}
+
 const base::DictionaryValue* ExtensionAPI::GetSchema(
     const std::string& full_name) {
   std::string child_name;
   std::string api_name = GetAPINameFromFullName(full_name, &child_name);
 
   const base::DictionaryValue* result = NULL;
   SchemaMap::iterator maybe_schema = schemas_.find(api_name);
   if (maybe_schema != schemas_.end()) {
     result = maybe_schema->second.get();
   } else {
@@ skipping 71 matching lines @@
       break;
 
     api_name_candidate = api_name_candidate.substr(0, last_dot_index);
   }
 
   *child_name = "";
   return std::string();
 }
 
 }  // namespace extensions