title: Android support design library CoordinatorLayout with webview problem
body: <p>I am using CoordinatorLayout with webview in my app.
  but I have a problem like the <strong>image</strong>:<br>
  <a href="https://i.stack.imgur.com/utdpF.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/utdpF.jpg" alt=""></a><br>
  <sub>(source: <a href="https://img5q.duitang.com/uploads/item/201507/05/20150705004730_FvBuG.png" rel="nofollow noreferrer">duitang.com</a>)</sub>  </p>
  
  <p>on 4.4+. I don't know what's the problem with my layout.</p>
  
  <p>this is my xml layout.</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:id="@+id/swipelayout"
      android:layout_width="match_parent"
      android:layout_height="match_parent"&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"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:fitsSystemWindows="true"&gt;
  
          &lt;android.support.design.widget.AppBarLayout
              android:id="@+id/appbar"
              android:layout_width="match_parent"
              android:layout_height="256dp"
              android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"&gt;
  
              &lt;android.support.design.widget.CollapsingToolbarLayout
                  android:id="@+id/collapsing_toolbar"
                  android:layout_width="match_parent"
                  android:layout_height="match_parent"
                  android:fitsSystemWindows="true"
                  app:contentScrim="?attr/colorPrimary"
                  app:expandedTitleMarginEnd="64dp"
                  app:expandedTitleMarginStart="48dp"
                  app:layout_scrollFlags="scroll|exitUntilCollapsed"&gt;
  
                  &lt;ImageView
                      android:id="@+id/backdrop"
                      android:layout_width="match_parent"
                      android:layout_height="match_parent"
                      android:fitsSystemWindows="true"
                      android:scaleType="centerCrop"
                      app:layout_collapseMode="parallax" /&gt;
  
                  &lt;android.support.v7.widget.Toolbar
                      android:id="@+id/toolbar"
                      android:layout_width="match_parent"
                      android:layout_height="?attr/actionBarSize"
                      app:layout_collapseMode="pin"
                      app:popupTheme="@style/ThemeOverlay.AppCompat.Light" /&gt;
  
              &lt;/android.support.design.widget.CollapsingToolbarLayout&gt;
  
  
          &lt;/android.support.design.widget.AppBarLayout&gt;
  
          &lt;android.support.v4.widget.NestedScrollView
              android:id="@+id/nsv_scroll"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:fitsSystemWindows="true"
              app:layout_behavior="@string/appbar_scrolling_view_behavior"&gt;
  
              &lt;android.support.v7.widget.CardView
                  android:layout_width="match_parent"
                  android:layout_height="match_parent"
                  android:layout_margin="16dp"&gt;
  
                  &lt;WebView
                      android:id="@+id/webview"
                      style="@style/Widget.CardContent"
                      android:layout_width="match_parent"
                      android:layout_height="match_parent"
                      android:minHeight="100dp"&gt;
  
  
                  &lt;/WebView&gt;
  
  
              &lt;/android.support.v7.widget.CardView&gt;
  
          &lt;/android.support.v4.widget.NestedScrollView&gt;
  
          &lt;com.getbase.floatingactionbutton.FloatingActionButton xmlns:fab="http://schemas.android.com/apk/res-auto"
              android:id="@+id/floatingaction"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_margin="16dp"
              android:clickable="true"
              app:layout_anchor="@id/appbar"
              app:layout_anchorGravity="bottom|right|end"
              fab:fab_colorNormal="?attr/colorAccent"
              fab:fab_colorPressed="?attr/colorAccentDark" /&gt;
  
      &lt;/android.support.design.widget.CoordinatorLayout&gt;
  &lt;/android.support.v4.widget.SwipeRefreshLayout&gt;
  </code></pre>
  
  <p>Expected layout:
  <a href="https://i.stack.imgur.com/o4zDw.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/o4zDw.jpg" alt=""></a><br>
  <sub>(source: <a href="https://img4q.duitang.com/uploads/item/201507/05/20150705010829_3cP85.png" rel="nofollow noreferrer">duitang.com</a>)</sub>  </p>