Added experiments section and exported the list of SafeBrowsing features in WebUI

components/safe_browsing/web_ui/BUILD.gn

 # 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.
 
 static_library("web_ui") {
   sources = [
     "safe_browsing_ui.cc",
     "safe_browsing_ui.h",
   ]
 
   deps = [
     ":constants",
     "//base",
     "//components/resources:components_resources_grit",
     "//components/resources:components_scaled_resources_grit",
+    "//components/safe_browsing:features",
     "//components/strings:components_strings_grit",
     "//content/public/browser",
     "//net",
     "//url",
   ]
 }
 
 static_library("constants") {
   sources = [
     "constants.cc",
     "constants.h",
   ]
 }