title: Apply elevation to TextInputLayout
body: <p>I'm trying to create a searchbar with similar styling to the Toolbar in the Google Photos app - that is, rounded with a drop shadow.</p>
  
  <p>We're using a TextInputLayout from the Material library as the sole child of a fragment (which gets inflated at the top of parent fragments).</p>
  
  <p>Below is what I have at the moment (I have a drawable available to use as the background once I can get the elevation to shop up, I've omitted that for clarity)</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;androidx.constraintlayout.widget.ConstraintLayout 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"
      tools:context=".Fragments.SearchFragment"&gt;
  
          &lt;com.google.android.material.textfield.TextInputLayout
              android:id="@+id/searchTextInputLayout"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:paddingTop="8dp"
              app:layout_constraintEnd_toEndOf="parent"
              app:layout_constraintStart_toStartOf="parent"
              app:layout_constraintTop_toTopOf="parent"&gt;
  
                  &lt;com.google.android.material.textfield.TextInputEditText
                      android:id="@+id/searchTextInputEditText"
                      android:layout_width="match_parent"
                      android:layout_height="wrap_content"
                      android:layout_marginStart="8dp"
                      android:layout_marginEnd="8dp"
                      android:paddingStart="24dp"
                      android:paddingEnd="24dp"
                      android:background="#ffffff"
                      android:elevation="20dp"
                      android:drawableStart="@drawable/ic_menu_black_24dp"
                      android:hint="Search" /&gt;
          &lt;/com.google.android.material.textfield.TextInputLayout&gt;
  &lt;/androidx.constraintlayout.widget.ConstraintLayout&gt;
  &lt;!--android:background="@drawable/searchbar_rounded"--&gt;
  </code></pre>
  
  <p>Am I missing something obvious here, or is this a limitation of the TextInputLayout?</p>