Add code generation for ExperimentalFeatures class from RuntimeEnabledFeatures.

third_party/WebKit/Source/core/core_generated.gypi

 # 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.
 
 {
   'includes': [
     '../bindings/core/core.gypi',  # for bindings_core_v8_output_dir
   ],
 
   'variables': {
@@ skipping 104 matching lines @@
 
       # Generated from make_style_shorthands.py
       '<(blink_core_output_dir)/StylePropertyShorthand.cpp',
 
       # Generated from make_style_builder.py
       '<(blink_core_output_dir)/StyleBuilder.cpp',
       '<(blink_core_output_dir)/StyleBuilderFunctions.cpp',
 
       # Generated from make_css_property_metadata.py
       '<(blink_core_output_dir)/CSSPropertyMetadata.cpp',
+
+      # Generated from make_experimental_features.py
+      '<(blink_core_output_dir)/experiments/ExperimentalFeatures.cpp',
+      '<(blink_core_output_dir)/experiments/ExperimentalFeatures.h',
     ],
   },
 }