[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/event_emitter.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/event_emitter.h"
+#include "extensions/renderer/bindings/event_emitter.h"
 
 #include <algorithm>
 
-#include "extensions/renderer/api_event_listeners.h"
+#include "extensions/renderer/bindings/api_event_listeners.h"
 #include "gin/data_object_builder.h"
 #include "gin/object_template_builder.h"
 #include "gin/per_context_data.h"
 
 namespace extensions {
 
 gin::WrapperInfo EventEmitter::kWrapperInfo = {gin::kEmbedderNativeGin};
 
 EventEmitter::EventEmitter(bool supports_filters,
                            std::unique_ptr<APIEventListeners> listeners,
@@ skipping 169 matching lines @@
           run_js_sync_.Run(listener, context, args->size(), args->data());
       if (!result.IsEmpty() && !result.Get(isolate)->IsUndefined())
         out_values->push_back(std::move(result));
     } else {
       run_js_.Run(listener, context, args->size(), args->data());
     }
   }
 }
 
 }  // namespace extensions