Use floating labels for preference forms

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

Index: chrome/android/java/res/values-v17/styles.xml
diff --git a/chrome/android/java/res/values-v17/styles.xml b/chrome/android/java/res/values-v17/styles.xml
index ce635c6af9e7b72b0249c1c2dcf7be0d7eac59f3..18f7f5677f7dc8b506291942e5d029fe9e32a258 100644
--- a/chrome/android/java/res/values-v17/styles.xml
+++ b/chrome/android/java/res/values-v17/styles.xml
@@ -11,6 +11,7 @@
         <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
@@ -51,6 +52,7 @@
         <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>
@@ -66,6 +68,10 @@
     <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>