Update web-platform-tests to revision d75cd4df6722acef7224eb6edcdc52b125680dad

tests/wpt/web-platform-tests/docs/running-tests/android_webview.md

@@ -0,0 +1,36 @@
+# Android WebView
+
+To run WPT on WebView on an Android device, some additional set-up is required.
+
+Currently, Android WebView support is experimental.
+
+* Please check [Chrome for Android](chrome_android) for the common
+  instructions for Android support first.
+
+* Install an up-to-date version of system webview shell:
+  * Go to
+  [chromium-browser-snapshots](https://commondatastorage.googleapis.com/chromium-browser-snapshots/index.html?prefix=Android/)
+  * Find the subdirectory with the highest number and click it.
+  * Download `chrome-android.zip` file and unzip it.
+  * Install `SystemWebViewShell.apk`.
+  * On emulator, system webview shell may already be installed by default. Then
+    you may need to remove the existing apk:
+     * Choose a userdebug build.
+     * Run an emulator with
+       [writable system partition from command line](https://chromium.googlesource.com/chromium/src/+/HEAD/docs/android_emulator.md/)
+
+* If you have an issue with ChromeDriver version, try removing
+  `_venv/bin/chromedriver` such that wpt runner can install a matching version
+  automatically. Failing that, please check your environment path and make
+  sure that no other ChromeDriver is used.
+
+Example command line:
+
+```bash
+./wpt run --test-type=testharness android_webview <TESTS>
+```
+
+* Note that there is no support for channel or automatic installation. The test
+  will be run against the current WebView version installed on the device.
+
+* Reftests are not supported at the moment.

tests/wpt/web-platform-tests/docs/running-tests/from-local-system.md

@@ -144,6 +144,7 @@ Additional browser-specific documentation:
 
   chrome
   chrome_android
+  android_webview
   safari
 ```