Document using specified process mode for Webview instrumentation tests
Bug: b:340651691 Change-Id: I7228da08036bbf680700b6ff37bd56320129b403 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5832865 Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org> Reviewed-by: Nate Fischer <ntfschr@chromium.org> Cr-Commit-Position: refs/heads/main@{#1350483}
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Chromium LUCI CQ

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@ -213,6 +213,17 @@ $ (shell) adb pull /data/anr/trace_01 /tmp/t1
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$ (shell) third_party/android_platform/development/scripts/stack --output-directory=out/Release /tmp/t1
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```
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#### Instrumentation test process modes
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You may use `--webview-process-mode` argument to run tests only in the
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specified process mode. The valid switch values are `multiple` and `single`.
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When the argument is not set (default), both process modes execute. Note that
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the argument acts as an additional filter on top of the
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[`OnlyRunIn` test annotation](https://source.chromium.org/chromium/chromium/src/+/main:android_webview/test/shell/src/org/chromium/android_webview/test/OnlyRunIn.java;drc=02c4c92d88aecbc14e715fd7fcac842d5dd814fe;l=25).
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Also note that in chromium CQ builders and all builders running tests on
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Android R and plus, `--webview-process-mode=multiple` is appended to the test
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command so that the instrumentation tests only run in multiple processes mode.
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## External tests
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