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 ------ The prebuilt libwebviewchromium.so included in these APKs is built from Chromium release tag 61.0.3163.98, using the GN build tool. To match our build settings, set: target_os="android" 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. ------ Due to WebView API changes in the O-MR1 release, the Java code in the Chromium 3163 branch is not compatible with O-MR1. We'll be working on upstreaming the O-MR1 specific Java changes to Chromium once the final O-MR1 SDK is released. ------ For questions about building WebView, please see https://groups.google.com/a/chromium.org/forum/#!forum/android-webview-dev