Add Settings[, Oberser] java code and JNI bridge.

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") {
@@ skipping 24 matching lines @@
 
   public_deps = [
     "//base",
     "//blimp/net",
   ]
 
   if (is_android) {
     sources += [
       "android/blimp_settings_android.cc",
       "android/blimp_settings_android.h",
+      "android/settings_android.cc",
+      "android/settings_android.h",
+      "android/settings_observer_proxy.cc",
+      "android/settings_observer_proxy.h",
     ]
 
     deps += [
       ":settings_jni_headers",
       "//blimp/client/core/session",
       "//blimp/common",
     ]
   }
 }
 
@@ skipping 19 matching lines @@
 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",
+      "android/java/src/org/chromium/blimp/core/settings/EmptySettingsObserver.java",
+      "android/java/src/org/chromium/blimp/core/settings/Settings.java",
+      "android/java/src/org/chromium/blimp/core/settings/SettingsObserver.java",
+      "android/java/src/org/chromium/blimp/core/settings/SettingsObserverProxy.java",
     ]
 
     # TODO(xingliu): Clean resources files in the future. http://crbug.com/630687.
     deps = [
       "//base:base_java",
       "//blimp/client/app:blimp_java_resources",
       "//blimp/client/core/common:common_java",
       "//blimp/client/public:public_headers_java",
       "//components/signin/core/browser/android:java",
       "//components/sync/android:sync_java",
       "//third_party/android_tools:android_support_v7_appcompat_java",
     ]
   }
 
   generate_jni("settings_jni_headers") {
     visibility = [ ":*" ]
 
     sources = [
       "android/java/src/org/chromium/blimp/core/settings/AboutBlimpPreferences.java",
+      "android/java/src/org/chromium/blimp/core/settings/Settings.java",
+      "android/java/src/org/chromium/blimp/core/settings/SettingsObserverProxy.java",
     ]
 
     jni_package = "blimp/client/core/settings"
   }
 }