Add user selectable Default Browser feature

- add Default Apps section in Apps / Advanced
- follow UX spec

This change depends on a Framework change which adds new APIs in PackageMaager
for setting and getting the default Browser App package name.

See bug #20144393

Change-Id: I2ff456eeaced9f740f4dd6fb6bccea6de6ea1308

res/xml/advanced_apps.xml

@@ -19,6 +19,12 @@
     xmlns:settings="http://schemas.android.com/apk/res/com.android.settings"
     android:key="applications_settings">
 
+    <PreferenceScreen
+        android:key="default_apps"
+        android:fragment="com.android.settings.applications.ManageDefaultApps"
+        android:title="@string/default_apps_title"
+        settings:keywords="@string/keywords_default_apps" />
+
     <PreferenceScreen
         android:key="manage_perms"
         android:fragment="com.android.settings.applications.ManagePermissions"

res/xml/default_apps.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2015 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<PreferenceScreen
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:settings="http://schemas.android.com/apk/res/com.android.settings"
+        android:key="default_apps">
+
+    <com.android.settings.applications.DefaultBrowserPreference
+            android:key="default_browser"
+            android:title="@string/default_browser_title"
+            android:summary="@string/default_browser_title_none"
+            />
+
+</PreferenceScreen>