Implement additional parts of the new ui for CBD.

chrome/android/java/res/layout/clear_browsing_data_tabs.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2017 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. -->
 
+<!-- Layout used by ClearBrowsingDataTabsFragment -->
+
 <android.support.design.widget.CoordinatorLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
     <android.support.design.widget.AppBarLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
 
+        <!-- RTL is handled manually in ClearBrowsingDataTabsFragment because
+             it is not working correctly with a ViewPager -->
         <android.support.design.widget.TabLayout
             android:id="@+id/clear_browsing_data_tabs"
+            android:layoutDirection="ltr"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             app:tabMode="fixed"
             app:tabGravity="fill" />
 
     </android.support.design.widget.AppBarLayout>
 
     <android.support.v4.view.ViewPager
         android:id="@+id/clear_browsing_data_viewpager"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         app:layout_behavior="@string/appbar_scrolling_view_behavior"  />
 </android.support.design.widget.CoordinatorLayout>