[documentation] Update some web_tests documentation relating to Android

Android is no longer supported for running web_tests (and has not been
for some time). The SmokeTests file however is still used, by the
Fuchsia bots.

Bug: 567947
Change-Id: Id4dde2b2d8751b9fadc2a94fdd682b78fba5aeb7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2629569Reviewed-by: Rakib Hasan <rmhasan@google.com>
Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Auto-Submit: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844212}

docs/testing/web_test_expectations.md

@@ -166,7 +166,7 @@ details.
   longer than the usual timeout to run. Slow tests are given 5x the usual
   timeout.
 * [SmokeTests](../../third_party/blink/web_tests/SmokeTests): A small subset
-  of tests that we run on the Android bot.
+  of tests that we run on the Fuchsia bots.
 * [StaleTestExpectations](../../third_party/blink/web_tests/StaleTestExpectations):
   Platform-specific lines that have been in TestExpectations for many months.
   They're moved here to get them out of the way of people doing rebaselines

docs/testing/web_tests.md

@@ -23,6 +23,15 @@ Chrome-specific tests only.
 
 ## Running Web Tests
 
+### Supported Platforms
+
+* Linux
+* MacOS
+* Windows
+* Fuchsia
+
+Android is [not supported](https://crbug.com/567947).
+
 ### Initial Setup
 
 Before you can run the web tests, you need to build the `blink_tests` target
@@ -32,16 +41,6 @@ to get `content_shell` and all of the other needed binaries.
 autoninja -C out/Default blink_tests
 ```
 
-On **Android** (web test support
-[currently limited to KitKat and earlier](https://crbug.com/567947)) you need to
-build and install `content_shell_apk` instead. See also:
-[Android Build Instructions](../android_build_instructions.md).
-
-```bash
-autoninja -C out/Default content_shell_apk
-adb install -r out/Default/apks/ContentShell.apk
-```
-
 On **Mac**, you probably want to strip the content_shell binary before starting
 the tests. If you don't, you'll have 5-10 running concurrently, all stuck being
 examined by the OS crash reporter. This may cause other failures like timeouts
@@ -63,12 +62,6 @@ use the build in `out/Default`, use:
 third_party/blink/tools/run_web_tests.py -t Default
 ```
 
-For Android (if your build directory is `out/android`):
-
-```bash
-third_party/blink/tools/run_web_tests.py -t android --android
-```
-
 *** promo
 * Windows users need to use `third_party/blink/tools/run_web_tests.bat` instead.
 * Linux users should not use `testing/xvfb.py`; `run_web_tests.py` manages Xvfb
@@ -86,12 +79,11 @@ learn more about TestExpectations and related files.
 
 *** promo
 Currently only the tests listed in
-[SmokeTests](../../third_party/blink/web_tests/SmokeTests)
-are run on the Android bots, since running all web tests takes too long on
-Android (and may still have some infrastructure issues). Most developers focus
-their Blink testing on Linux. We rely on the fact that the Linux and Android
-behavior is nearly identical for scenarios outside those covered by the smoke
-tests.
+[SmokeTests](../../third_party/blink/web_tests/SmokeTests) are run on the
+Fuchsia bots, since running all web tests takes too long on Fuchshia. Most
+developers focus their Blink testing on Linux. We rely on the fact that the
+Linux and Fuchsia behavior is nearly identical for scenarios outside those
+covered by the smoke tests.
 ***
 
 To run only some of the tests, specify their directories or filenames as

third_party/blink/web_tests/SmokeTests

+# This file lists a limited set of web tests that are run on platforms where
+# executing all web tests is infeasible (usually due to performance or resource
+# constraints). As of Q1 2021, only Fuchsia uses this file by default (of
+# platforms that run web tests).
+#
+# Further documentation:
+# https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_test_expectations.md
+
 accessibility/aria-labelledby-on-input.html
 accessibility/aria-link-supports-press.html
 accessibility/insert-adjacent-html-causes-crash.xhtml