Provides support for resources.arsc generation enabling
the setting of an application icon.
If an asset/icon.png is encountered during build, then
the resources.arsc is generated to identify a single
xxxhdpi resource and the manifest will be updated to
reference resource as app icon.
References golang/go#9985
Change-Id: I9ef59fff45dcd612a41c479b2c679d22c094ab36
Reviewed-on: https://go-review.googlesource.com/30019
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
eed0461ac2