Support embedded plugins with MimeHandlerView.

chrome/browser/extensions/plugin_manager.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 "base/files/file_path.h"
 #include "base/lazy_instance.h"
 #include "base/path_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/plugin_manager.h"
@@ skipping 79 matching lines @@
     content::WebPluginInfo info;
     info.type = content::WebPluginInfo::PLUGIN_TYPE_BROWSER_PLUGIN;
     info.name = base::UTF8ToUTF16(handler->extension_id());
     info.path = base::FilePath::FromUTF8Unsafe(handler->extension_id());
 
     for (std::set<std::string>::const_iterator mime_type =
          handler->mime_type_set().begin();
          mime_type != handler->mime_type_set().end(); ++mime_type) {
       content::WebPluginMimeType mime_type_info;
       mime_type_info.mime_type = *mime_type;
+      base::FilePath::StringType file_extension;
+      if (net::GetPreferredExtensionForMimeType(*mime_type, &file_extension)) {
+        mime_type_info.file_extensions.push_back(
+            base::FilePath(file_extension).AsUTF8Unsafe());
+      }
       info.mime_types.push_back(mime_type_info);
     }
 
     PluginService::GetInstance()->RefreshPlugins();
     PluginService::GetInstance()->RegisterInternalPlugin(info, true);
   }
 
   if (plugins_or_nacl_changed)
     PluginService::GetInstance()->PurgePluginListCache(profile_, false);
 }
@@ skipping 110 matching lines @@
        iter != nacl_module_list_.end(); ++iter) {
     if (iter->url == url)
       return iter;
   }
   return nacl_module_list_.end();
 }
 
 #endif  // !defined(DISABLE_NACL)
 
 }  // namespace extensions