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 81.0.4044.138, 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
ffmpeg_branding = "Chrome"
proprietary_codecs = true
enable_resource_whitelist_generation = false
enable_remoting = true
is_component_build = false
symbol_level = 0
enable_nacl = false
blink_symbol_level = 0
android_default_version_name = "81.0.4044.138"
android_default_version_code = "4044138$$"

$$ depends on device ARCH
(00=arm, 50=arm64, 10=x86, 60=x64)

in your GN argument file before building.

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Replace webview icon:

From the chromium/src directory:

mkdir -p android_webview/apk/java/res/drawable-xxxhdpi
cp chrome/android/java/res_chromium/mipmap-mdpi/app_icon.png android_webview/apk/java/res/drawable-mdpi/icon_webview.png
cp chrome/android/java/res_chromium/mipmap-hdpi/app_icon.png android_webview/apk/java/res/drawable-hdpi/icon_webview.png
cp chrome/android/java/res_chromium/mipmap-xhdpi/app_icon.png android_webview/apk/java/res/drawable-xhdpi/icon_webview.png
cp chrome/android/java/res_chromium/mipmap-xxhdpi/app_icon.png android_webview/apk/java/res/drawable-xxhdpi/icon_webview.png
cp chrome/android/java/res_chromium/mipmap-xxxhdpi/app_icon.png android_webview/apk/java/res/drawable-xxxhdpi/icon_webview.png

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Extra patches:
patches/chromium-theme-color.patch: Provides a callback when a theme color is set by the page

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