[android_webview] Add the apk resources to the Android build.
[android_webview] Add the apk resources to the Android build.

This adds the resources from the apk/ folder to the Android build
to enable removing the downstream resources.

BUG=None
TESTS=android_aosp bot
R=torne@chromium.org
TBR=torne@chromium.org

Review URL: https://codereview.chromium.org/828153004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#311268}

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