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Defines web_engine_shell target in isolate map, while also adding
additional build targets for fuchsia-builder-perf-fyi.

Change-Id: I9e11dda427f6461ce948ba104a7e09d1657511d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2644345Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Rohan Pavone <rohpavone@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846301}