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Rearrange the WebAPK resources such that a higher density
app_icon_<density>.png can be used as the splash_icon.xml and add
app_icon.xml to not break anything as a result of moving and renaming
the app_icon.png files.

Also adds a splashId to the AndroidManifest.xml for use in Chrome such
that the WebAPK can update the splash screen image rather than using
the primaryIcon for the splash screen.

Modifies Chrome code to support decoding XML aliases to images.

TBR=dominickn@chromium.org

Bug: 819755
Change-Id: Id42c2e898a5996dfba46ad6608cc1d3103300521
Reviewed-on: https://chromium-review.googlesource.com/1128256
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Xi Han <hanxi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576471}