[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/api_binding_test.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/api_binding_test.h"
+#include "extensions/renderer/bindings/api_binding_test.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "gin/array_buffer.h"
 #include "gin/public/context_holder.h"
 #include "gin/public/isolate_holder.h"
 #include "gin/v8_initializer.h"
 
 namespace extensions {
 
@@ skipping 114 matching lines @@
 void APIBindingTest::RunGarbageCollection() {
   // '5' is a magic number stolen from Blink; arbitrarily large enough to
   // hopefully clean up all the various paths.
   for (int i = 0; i < 5; ++i) {
     isolate()->RequestGarbageCollectionForTesting(
         v8::Isolate::kFullGarbageCollection);
   }
 }
 
 }  // namespace extensions