[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/api_invocation_errors_unittest.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 "testing/gtest/include/gtest/gtest.h"
 
 namespace extensions {
 namespace api_errors {
 
 // Tests chaining errors for more complicated errors. More of a set of example
 // strings than a test of the logic itself (which is pretty simple).
 TEST(APIInvocationErrors, ChainedErrors) {
   EXPECT_EQ("Error at index 0: Invalid type: expected string, found integer.",
@@ skipping 19 matching lines @@
   EXPECT_EQ(
       "Error in invocation of tabs.query("
       "object details, function callback): "
       "Error at parameter 'details': Unexpected property: 'foo'.",
       InvocationError("tabs.query", "object details, function callback",
                       ArgumentError("details", UnexpectedProperty("foo"))));
 }
 
 }  // namespace api_errors
 }  // namespace extensions