Add the basic infrastructure for the Behavior feature type: BehaviorFeature and

extensions/common/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 # GYP version: extensions/extensions.gyp:extensions_common_constants
 source_set("common_constants") {
   sources = [
@@ skipping 82 matching lines @@
       "features/json_feature_provider_source.cc",
       "features/json_feature_provider_source.h",
       "features/manifest_feature.cc",
       "features/manifest_feature.h",
       "features/permission_feature.cc",
       "features/permission_feature.h",
       "features/simple_feature.cc",
       "features/simple_feature.h",
       "features/simple_feature_filter.cc",
       "features/simple_feature_filter.h",
+      "features/behavior_feature.cc",
+      "features/behavior_feature.h",
       "file_util.cc",
       "file_util.h",
       "guest_view/guest_view_constants.cc",
       "guest_view/guest_view_constants.h",
       "image_util.cc",
       "image_util.h",
       "install_warning.cc",
       "install_warning.h",
       "manifest.cc",
       "manifest.h",
@@ skipping 139 matching lines @@
         "manifest_handlers/nacl_modules_handler.cc",
         "manifest_handlers/nacl_modules_handler.h",
       ]
     }
 
     if (is_win) {
       cflags = [ "/wd4267" ]  # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     }
   }
 }  # enable_extensions