[Retry] PPAPI: Add new PPB_FileRef.MakeDirectory to support exclusive operation

ppapi/proxy/interface_list.cc

 // Copyright (c) 2012 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 "ppapi/proxy/interface_list.h"
 
 #include "base/lazy_instance.h"
 #include "base/memory/singleton.h"
 #include "ppapi/c/dev/ppb_alarms_dev.h"
 #include "ppapi/c/dev/ppb_audio_input_dev.h"
@@ skipping 176 matching lines @@
     Permission current_required_permission = PERMISSION_PRIVATE;
     #include "ppapi/thunk/interfaces_ppb_private.h"
   }
   {
 #if !defined(OS_NACL)
     Permission current_required_permission = PERMISSION_FLASH;
     #include "ppapi/thunk/interfaces_ppb_private_flash.h"
 #endif  // !defined(OS_NACL)
   }
   {
-    // TODO(teravest): These lines should be uncommented when a dev channel
-    // interface is added.  They're commented right now because they cause an
-    // unused variable warning.
-    //
-    // Permission current_required_permission = PERMISSION_DEV_CHANNEL;
-    // #include "ppapi/thunk/interfaces_ppb_public_dev_channel.h"
+    Permission current_required_permission = PERMISSION_DEV_CHANNEL;
+    #include "ppapi/thunk/interfaces_ppb_public_dev_channel.h"
   }
 
   #undef PROXIED_API
   #undef PROXIED_IFACE
 
   // Manually add some special proxies. Some of these don't have interfaces
   // that they support, so aren't covered by the macros above, but have proxies
   // for message routing. Others have different implementations between the
   // proxy and the impl and there's no obvious message routing.
   AddProxy(API_ID_RESOURCE_CREATION, &ResourceCreationProxy::Create);
@@ skipping 147 matching lines @@
 }
 
 void InterfaceList::AddPPP(const char* name,
                            const void* iface) {
   DCHECK(name_to_plugin_info_.find(name) == name_to_plugin_info_.end());
   name_to_plugin_info_[name] = InterfaceInfo(iface, PERMISSION_NONE);
 }
 
 }  // namespace proxy
 }  // namespace ppapi