Android - Introduce "keyboard accessory" for Autofill suggestions.

ui/android/java/res/drawable/autofill_accessory_view_border.xml

Index: ui/android/java/res/drawable/autofill_accessory_view_border.xml
diff --git a/ui/android/java/res/drawable/autofill_accessory_view_border.xml b/ui/android/java/res/drawable/autofill_accessory_view_border.xml
new file mode 100644
index 0000000000000000000000000000000000000000..d7d0630ccf010140fe1d5b364b5ca7a2c5501b4f
--- /dev/null
+++ b/ui/android/java/res/drawable/autofill_accessory_view_border.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright 2015 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.
+-->
+
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

[newt (away), 2015/04/24 17:45:12]

Android doesn't have a great way to draw backgrounds with borders on only
certain sides. Here's another way to do it:

  <inset xmlns:android="http://schemas.android.com/apk/res/android"
      android:insetBottom="-1dp"
      android:insetLeft="-1dp"
      android:insetRight="-1dp">
  
      <shape android:shape="rectangle">
          <stroke android:width="1dp" android:color="@android:color/black" />
          <solid android:color="@android:color/white" />
      </shape>
  
  </inset>

What you have is fine too (just see my comment below).

Also, consider using 1dp instead of 1px. 1px is almost indiscernible on an
xxxhdpi device. (We should probably create @dimen/hairline for something that's
usually 1px, but on super high res devices is 2px. This comes up now and then.)

[Evan Stade, 2015/04/24 21:19:18]

I've gone with your code because it's shorter.

This background is temporary. It doesn't match the mocks, I just added it
because I didn't want to attempt to make everything match the mocks in one go
and this is the most reasonable looking background for now.

+   <item>
+      <shape android:shape="rectangle">
+         <stroke android:width="1px" android:color="@android:color/black" />

[newt (away), 2015/04/24 17:45:12]

Defining a <shape> without a <solid> causes trouble on certain devices. They'll
draw the background color as black if you don't specify anything. You can fix
this by adding a <solid> element with the color set to transparent.

+      </shape>
+   </item>
+   <item android:top="1px">
+      <shape android:shape="rectangle">
+          <solid android:color="@android:color/white"/>
+      </shape>
+   </item>
+</layer-list>