[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/api_event_handler_unittest.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_event_handler.h"
+#include "extensions/renderer/bindings/api_event_handler.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/memory/ptr_util.h"
 #include "base/optional.h"
 #include "base/test/mock_callback.h"
 #include "base/values.h"
 #include "extensions/common/event_filtering_info.h"
-#include "extensions/renderer/api_binding_test.h"
-#include "extensions/renderer/api_binding_test_util.h"
+#include "extensions/renderer/bindings/api_binding_test.h"
+#include "extensions/renderer/bindings/api_binding_test_util.h"
 #include "gin/arguments.h"
 #include "gin/converter.h"
 #include "gin/public/context_holder.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace extensions {
 
 namespace {
 
 using MockEventChangeHandler = ::testing::StrictMock<
@@ skipping 1002 matching lines @@
         "(function(event, listener) { event.removeListener(listener); })";
     v8::Local<v8::Value> args[] = {event, listener};
     RunFunction(FunctionFromString(context, kRemoveListener), context,
                 arraysize(args), args);
   }
 
   EXPECT_EQ(0u, handler.GetNumEventListenersForTesting(kEventName, context));
 }
 
 }  // namespace extensions