Building the Chromium-based WebView in AOSP is no longer supported. WebView can
now be built entirely from the Chromium source code.

General instructions for building WebView from Chromium:
https://www.chromium.org/developers/how-tos/build-instructions-android-webview

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The prebuilt libwebviewchromium.so included in these APKs is built from Chromium
release tag 51.0.2704.106. To match our build settings, use
https://gist.github.com/luca020400/aca28ac562d1de54fe94688d11578812 as reference

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For questions about building WebView, please see
https://groups.google.com/a/chromium.org/forum/#!forum/android-webview-dev