Show the image header for the Context Menu

chrome/android/java/res/drawable/checkerboard_background.xml

Index: chrome/android/java/res/drawable/checkerboard_background.xml
diff --git a/chrome/android/java/res/drawable/checkerboard_background.xml b/chrome/android/java/res/drawable/checkerboard_background.xml
new file mode 100644
index 0000000000000000000000000000000000000000..8b1e9065085d54f3c15e5eb5e9a48d6c814ef843
--- /dev/null
+++ b/chrome/android/java/res/drawable/checkerboard_background.xml
@@ -0,0 +1,31 @@
+<?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. -->
+
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item>
+        <shape android:shape="rectangle">
+            <solid android:color="@android:color/white" />
+            <size android:height="10dp" android:width="10dp"/>
+        </shape>
+    </item>
+    <item android:top="0dp" android:left="10dp">
+        <shape android:shape="rectangle">
+            <solid android:color="@color/google_grey_200"/>
+            <size android:height="10dp" android:width="10dp"/>
+        </shape>
+    </item>
+    <item android:top="10dp" android:left="0dp">
+        <shape android:shape="rectangle">
+            <solid android:color="@color/google_grey_200"/>
+            <size android:height="10dp" android:width="10dp"/>
+        </shape>
+    </item>
+    <item android:top="10dp" android:left="10dp">
+        <shape android:shape="rectangle">
+            <solid android:color="@android:color/white" />
+            <size android:height="10dp" android:width="10dp"/>
+        </shape>
+    </item>
+</layer-list>