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 44.0.2403.114. To match our build settings, set: GYP_DEFINES="OS=android release_unwind_tables=0 buildtype=Official chrome_build_id='2e7c7a0f-c733-4b9a-9c8e-d3cf0938369b'" in your environment before running build/gyp_chromium. ------ Due to WebView API changes in the M release, the Java code in the Chromium 2403 branch is not compatible with M. We'll be working on upstreaming the M-specific Java changes to Chromium once the final M SDK is released. ------ For questions about building WebView, please see https://groups.google.com/a/chromium.org/forum/#!forum/android-webview-dev