Implement orderfile auto-generation for WebView (2/n)

Previous change: crrev.com/i/8483917

This change:
1. Assign WebView orderfile builders to the chrome.orderfile group
2. Allow orderfile bots to be used in CQ
3. Introduce a profile-webview parameter to differentiate between Chrome
and WebView profiling. However this parameter currently does nothing

Design doc: go/webview-orderfile

Bug: 435633362
Change-Id: Iedc2ffd97e8bde9470c10fcf61a2733a989d7278
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6818880
Reviewed-by: Garrett Beaty <gbeaty@google.com>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Reviewed-by: Mateusz Zbikowski <zbikowski@google.com>
Commit-Queue: Trung Nguyen <tne@google.com>
Cr-Commit-Position: refs/heads/main@{#1499589}