Update Switch track in SwitchPreference on watch am: 21f989f8

<?xml version="1.0" encoding="utf-8"?>

<!-- Copyright (C) 2016 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.

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     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

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<!-- Used for the background of switch track for watch switch preference. -->

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_enabled="false"

          android:alpha="0.4" android:color="?attr/colorPrimary" />

    <item android:color="?attr/colorPrimary" />

    <item android:state_enabled="false">

        <bitmap android:alpha="0.1" android:src="@drawable/watch_switch_track_mtrl_alpha" />

    </item>

    <item>

        <bitmap android:alpha="0.2" android:src="@drawable/watch_switch_track_mtrl_alpha" />

    </item>

</selector>

    android:thumb="@drawable/watch_switch_thumb_material_anim"

    android:thumbTint="@color/watch_switch_thumb_color_material"

    android:thumbTintMode="multiply"

    android:track="@drawable/watch_switch_track_mtrl"

    android:trackTint="@color/watch_switch_track_color_material"

    android:track="@drawable/watch_switch_track_material"

    android:focusable="false"

    android:clickable="false"

    android:background="@null" />