Create the base Custom Context Menu Dialog.

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..6da84753f3ebc41c55222b62d1ebca62335baecd
--- /dev/null
+++ b/chrome/android/java/res/drawable/checkerboard_background.xml
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item>
+        <shape android:shape="rectangle">
+            <solid android:color="#FFFFFF" />
+            <size android:height="10dp" android:width="10dp"/>
+        </shape>
+    </item>
+    <item android:top="0dp" android:left="10dp">
+        <shape android:shape="rectangle">
+            <solid android:color="#EEE"/>
+            <size android:height="10dp" android:width="10dp"/>
+        </shape>
+    </item>
+    <item android:top="10dp" android:left="0dp">
+        <shape android:shape="rectangle">
+            <solid android:color="#EEE"/>
+            <size android:height="10dp" android:width="10dp"/>
+        </shape>
+    </item>
+    <item android:top="10dp" android:left="10dp">
+        <shape android:shape="rectangle">
+            <solid android:color="#FFFFFF" />
+            <size android:height="10dp" android:width="10dp"/>
+        </shape>
+    </item>
+</layer-list>