Change launcher icons to MaskableIconDrawable

Test: manual test

b/34853793

Change-Id: I3376c03e84a0a9d94190b930f16596b3e48e9a9d

AndroidManifest.xml

@@ -83,7 +83,7 @@
     <uses-permission android:name="android.permission.DELETE_PACKAGES"/>
 
     <application android:label="@string/settings_label"
-            android:icon="@mipmap/ic_launcher_settings"
+            android:icon="@drawable/ic_launcher_settings"
             android:taskAffinity=""
             android:theme="@style/Theme.Settings"
             android:hardwareAccelerated="true"

res/drawable/ic_launcher_settings.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<maskable-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:color="?android:attr/colorAccent"/>
+    <foreground android:drawable="@mipmap/ic_launcher_settings"/>
+</maskable-icon>