Merge commit 'efc56ea'

    Add back.png to the Nfc app's drawable-mdpi

    On mdpi devices the Nfc app will crash if it
    can't load this resource.

Change-Id: Ifa7a0db150e48b3c3d04e8945269c32b6a0e3981
diff --git a/res/drawable-mdpi/back.png b/res/drawable-mdpi/back.png
new file mode 100644
index 0000000..dcad41d
--- /dev/null
+++ b/res/drawable-mdpi/back.png
Binary files differ