Create a PrefStore in support of Blimp metrics collection.

blimp/engine/BUILD.gn

 # Copyright 2015 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("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//tools/grit/repack.gni")
 import("//tools/grit/grit_rule.gni")
@@ skipping 105 matching lines @@
     "//ui/platform_window/stub/",
   ]
 }
 
 source_set("common") {
   sources = [
     "common/blimp_browser_context.cc",
     "common/blimp_browser_context.h",
     "common/blimp_content_client.cc",
     "common/blimp_content_client.h",
+    "common/blimp_pref_store.cc",
+    "common/blimp_pref_store.h",
   ]
 
   deps = [
     "//base",
+    "//components/prefs",
     "//components/version_info",
     "//content/public/common",
     "//ui/base",
   ]
 }
 
 source_set("feature") {
   sources = [
     "feature/engine_render_widget_feature.cc",
     "feature/engine_render_widget_feature.h",
@@ skipping 171 matching lines @@
       _rebased_dockerfile,
       "--startup-script",
       _rebased_startup_script,
       "--manifest",
       _rebased_manifest,
       "--output",
       rebase_path(_bundle),
     ]
   }
 }