[wptrunner] Add additional package argument to enable running on Trichrome WebView

This change enables Trichrome support for WebView. Trichrome Webview requires additional apks to be installed prior to installing WebView apk.
Build target change will be followed up CL to support building for trichrome and trichrome64.
Tested on Android 29(Q) emulator with:
```
export TARGET=AndroidQ
autoninja -C out/$TARGET system_webview_wpt_trichrome
./third_party/blink/tools/run_wpt_tests.py -t $TARGET --product android_webview  --webview-provider out/$TARGET/apks/TrichromeWebView.apk --browser-apk out/$TARGET/apks/SystemWebViewShell.apk third_party/blink/web_tests/wpt_internal/environment-integrity/android-specific.sub.https.html --additional-apk out/$TARGET/apks/TrichromeLibrary.apk --avd-config tools/android/avd/proto/generic_android29.textpb
```

Bug: 1455021
Change-Id: Ifa6b761188ac2a48cda3c27fd53f3da05d6dcd98
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4781495


Reviewed-by: Weizhong Xia <weizhong@google.com>
Commit-Queue: An Sung <ansung@google.com>
Cr-Commit-Position: refs/heads/main@{#1184815}