pt 1 in reviving the android build (copied from pm 28a1, wish me luck)

mobile/android/base/resources/drawable/tab_history_bg.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
+    <item>
+        <shape
+            xmlns:android="http://schemas.android.com/apk/res/android"
+            android:shape="rectangle" >
+            <stroke
+                android:width="@dimen/tab_history_bg_width"
+                android:color="@color/tab_history_border_color" />
+
+            <padding android:top="@dimen/tab_history_border_padding" />
+        </shape>
+    </item>
+    <item>
+        <shape
+            xmlns:android="http://schemas.android.com/apk/res/android"
+            android:shape="rectangle" >
+            <solid
+                android:width="@dimen/tab_history_bg_width"
+                android:color="@color/toolbar_grey" />
+        </shape>
+    </item>
+</layer-list>