Software keyboard is not rendered correctly on Android 6 if non-material theme is selected.

[yukawa]

Environment

Confirmed with Mozc 2.17.2288.102 running on Android 6.0.1 MNB29K / Nexus 5 2013.
This issue is not reproducible with Android 5.1 or prior.

Steps to reproduce

1. Build Mozc 2.17.2288.102 for Android.
2. Install Mozc into Android 6.0.1 MMB29K on Nexus 5 2013.
3. Launch Mozc's settings app from the launcher.
4. Go to Keyboard theme and select Blue/Dark-gray.
5. Go to Mozc's settings again.
6. Enable Mozc and switch to it on a focused EditText.

Expected behavior

• After step 5, keyboard preview is correctly rendered in Keyboard layout section in the settings app.
• After step 6, software keyboard is correctly rendered.

Actual behavior

• After step 5, a black square is rendered instead of correctly-rendered keyboard preview in `Keyboard layout`` section in the settings app.
• After step 6, only a gray blank area is rendered where software keyboard should be rendered.
  

Additional Information

The root cause is that Mozc's SkinParser.java has relied on a broken implementation of Drawable.createFromXmlInner(), which was recently fixed in Android M by aosp-mirror/platform_frameworks_base@b63b93d.

Internal Issue ID 23951337