Blimp Settings framework on the c++ side

blimp/client/core/settings/BUILD.gn

 # Copyright 2016 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.
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
 
 source_set("settings") {
   visibility = [
     "//blimp/client/app:*",  # TODO(nyquist): Remove this. See crbug/651964.
     "//blimp/client/core/*",
   ]
 
   sources = [
     "blimp_settings_delegate.h",
+    "settings.cc",
+    "settings.h",
     "settings_feature.cc",
     "settings_feature.h",
+    "settings_observer.h",
+    "settings_prefs.cc",
+    "settings_prefs.h",
   ]
 
   deps = [
+    "//blimp/client/core/switches",
     "//blimp/common",
+    "//components/prefs",
     "//net",
   ]
 
   public_deps = [
     "//base",
     "//blimp/net",
   ]
 
   if (is_android) {
     sources += [
       "android/blimp_settings_android.cc",
       "android/blimp_settings_android.h",
     ]
 
     deps += [
       ":settings_jni_headers",
       "//blimp/client/core/session",
       "//blimp/common",
     ]
   }
 }
 
+source_set("unit_tests") {
+  visibility = [ "//blimp/client/core:unit_tests" ]
+
+  testonly = true
+
+  sources = [
+    "settings_unittest.cc",
+  ]
+
+  deps = [
+    ":settings",
+    "//base",
+    "//blimp/client/core/switches:switches",
+    "//components/prefs:test_support",
+    "//testing/gmock",
+    "//testing/gtest",
+  ]
+}
+
 if (is_android) {
   android_library("settings_java") {
     visibility = [
       "//blimp/client/app:*",  # TODO(nyquist): Remove this. See crbug/651964.
       "//blimp/client/core/*",
     ]
 
     java_files = [
       "android/java/src/org/chromium/blimp/core/settings/AboutBlimpPreferences.java",
       "android/java/src/org/chromium/blimp/core/settings/BlimpPreferencesDelegate.java",
@@ skipping 14 matching lines @@
   generate_jni("settings_jni_headers") {
     visibility = [ ":*" ]
 
     sources = [
       "android/java/src/org/chromium/blimp/core/settings/AboutBlimpPreferences.java",
     ]
 
     jni_package = "blimp/client/core/settings"
   }
 }