title: webview ocuping whole screen, covering the toolbars
body: <p>I have an app with two toolbars and a webview. When the user slides up in the webview the top toolbar should slide and hide, when he slides down the top toolbar should slide and show, much like the youtube app does.</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:fitsSystemWindows="true"
      tools:context="com.moover.moover.MainActivity"&gt;
  
      &lt;android.support.design.widget.AppBarLayout
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
          android:fitsSystemWindows="true"&gt;
  
          &lt;android.support.v7.widget.Toolbar
                  android:id="@+id/toolbar"
                  android:layout_width="match_parent"
                  android:layout_height="?attr/actionBarSize"
                  android:background="?attr/colorPrimary"
                  app:popupTheme="@style/AppTheme.PopupOverlay"
                  app:layout_scrollFlags="scroll|enterAlways" /&gt;
  
              &lt;android.support.v7.widget.Toolbar
                  android:id="@+id/toolbar2"
                  android:layout_width="match_parent"
                  android:layout_height="?attr/actionBarSize"
                  android:background="?attr/colorPrimary"
                  app:popupTheme="@style/AppTheme.PopupOverlay"&gt;
                  &lt;TextView
                      android:id="@+id/textViewWebPage"
                      android:layout_width="match_parent"
                      android:layout_height="match_parent" /&gt;
              &lt;/android.support.v7.widget.Toolbar&gt;
  
      &lt;/android.support.design.widget.AppBarLayout&gt;
  
      &lt;android.support.v7.widget.RecyclerView
          android:id="@+id/rcView"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          app:layout_behavior="@string/appbar_scrolling_view_behavior"
          /&gt;
  
      &lt;WebView  xmlns:android="http://schemas.android.com/apk/res/android"
          android:id="@+id/webview"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          /&gt;
  
  &lt;/android.support.design.widget.CoordinatorLayout&gt;
  </code></pre>
  
  <p>Currently the webview is covering the toolbars ocupying the whole screen and it's not scrollable</p>