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 57.0.2939.0, using the GN build tool (not the older GYP tool). To match our build settings, set:

target_os="android"
target_cpu="arm"
is_debug=false
is_official_build=true
is_chrome_branded=false
use_official_google_api_keys=false
exclude_unwind_tables=true
enable_resource_whitelist_generation=true
ffmpeg_branding="Chrome"
proprietary_codecs=true
enable_remoting=true

in your GN argument file before building.

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