Upstreaming AppMenu.

chrome/android/java/res/drawable-sw600dp/back_button_selector.xml

Index: chrome/android/java/res/drawable-sw600dp/back_button_selector.xml
diff --git a/chrome/android/java/res/drawable-sw600dp/back_button_selector.xml b/chrome/android/java/res/drawable-sw600dp/back_button_selector.xml
new file mode 100644
index 0000000000000000000000000000000000000000..3b0b04272661e14e1740f07a64627d71e8877409
--- /dev/null
+++ b/chrome/android/java/res/drawable-sw600dp/back_button_selector.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!-- Copyright (c) 2011 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.
+-->
+
+<!-- Pending assets, we use different alpha values for enabled/disabled states. -->
+<selector xmlns:android="http://schemas.android.com/apk/res/android">

[David Trainor- moved to gerrit, 2013/11/25 18:25:21]

All of these *_button_selector drawables are identical.  Can we just use the
default one?

[aurimas (slooooooooow), 2013/11/26 00:15:38]

I can delete sw600dp but not ldrtl because in rtl mode back is in the other
direction.

+    <item android:state_enabled="false"
+        android:drawable="@drawable/back_disabled" />
+    <item android:drawable="@drawable/back" />
+</selector>