Use floating labels for preference forms

chrome/android/java/res/values-v17/styles.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2014 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.
 -->
 
 <resources>
     <!-- Preferences -->
     <style name="PreferencesTheme" parent="ThemeWithActionBar">
         <item name="android:textColorLink">@color/pref_accent_color</item>
         <item name="android:buttonStyle">@style/PreferenceButtonStyle</item>
         <item name="android:textAppearanceMedium">@style/PreferenceTextAppearanceMedium</item>
         <item name="android:preferenceCategoryStyle">@style/PreferenceCategory</item>
+        <item name="floatLabelTextAppearance">@style/PreferenceFloatLabelTextAppearance</item>
     </style>
     <style name="PreferenceButtonStyle" parent="@android:style/Widget.Holo.Light.Button">
         <!-- TODO(twellington): Delete btn_default_preferences.xml once the AppCompat theme supports
                                 Material-like buttons. -->
         <item name="android:background">@drawable/btn_default_preferences</item>
         <item name="android:textAllCaps">true</item>
         <item name="android:textColor">#fff</item>
         <item name="android:textSize">14sp</item>
         <item name="android:textStyle">bold</item>
     </style>
@@ skipping 20 matching lines @@
     <style name="PreferenceTitle">
         <item name="android:ellipsize">end</item>
         <item name="android:singleLine">true</item>
         <item name="android:textAppearance">?android:attr/textAppearanceMedium</item>
     </style>
     <style name="PreferenceSummary">
         <item name="android:textAppearance">?android:attr/textAppearanceSmall</item>
         <item name="android:textColor">?android:attr/textColorSecondary</item>
     </style>
     <style name="PreferenceScreenLayout">
+        <item name="android:paddingTop">16dp</item>
         <item name="android:paddingStart">16dp</item>
         <item name="android:paddingEnd">16dp</item>
     </style>
     <style name="PreferenceLayoutBase">
         <item name="android:background">?android:attr/activatedBackgroundIndicator</item>
         <item name="android:minHeight">?android:attr/listPreferredItemHeight</item>
         <item name="android:paddingTop">6dp</item>
         <item name="android:paddingBottom">6dp</item>
         <item name="android:paddingStart">8dp</item>
         <item name="android:paddingEnd">8dp</item>
     </style>
     <style name="PreferenceLayout" parent="PreferenceLayoutBase" />
     <style name="DeprecationWarningPreferenceTheme" parent="PreferencesTheme">
         <item name="android:textSize">14sp</item>
     </style>
+    <style name="PreferenceFloatLabelTextAppearance">
+        <item name="android:textColor">@color/float_label</item>
+        <item name="android:textSize">14sp</item>
+    </style>
 
     <style name="ThemeWithActionBar" parent="Theme.AppCompat.Light.DarkActionBar">
         <item name="android:windowBackground">@android:color/white</item>
         <!-- Action bar color -->
         <item name="colorPrimary">#263238</item>
         <!-- Status bar color -->
         <item name="colorPrimaryDark">#161e21</item>
         <!-- Color of checkboxes, switches, buttons, etc. -->
         <item name="colorAccent">@color/pref_accent_color</item>
     </style>
@@ skipping 93 matching lines @@
     <style name="info_bubble">
         <item name="android:textColor">@android:color/white</item>
         <item name="android:textStyle">bold</item>
         <item name="android:textSize">18sp</item>
     </style>
     <style name="FullscreenNotificationBubble" parent="@android:style/Animation.Toast">
         <item name="android:windowEnterAnimation">@anim/fullscreen_notification_in</item>
     </style>
 
 </resources>