[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/api_invocation_errors.cc

 // Copyright 2017 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_invocation_errors.h"
+#include "extensions/renderer/bindings/api_invocation_errors.h"
 
 #include <vector>
 
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 
 namespace extensions {
 namespace api_errors {
 
 const char kTypeString[] = "string";
@@ skipping 98 matching lines @@
 std::string InvocationError(const std::string& method_name,
                             const std::string& expected_signature,
                             const std::string& error) {
   return base::StringPrintf("Error in invocation of %s(%s): %s",
                             method_name.c_str(), expected_signature.c_str(),
                             error.c_str());
 }
 
 }  // namespace api_errors
 }  // namespace extensions