Run Fuchsia Perf Testers on stronger machines.

This is to fix this type of errors:
https://ci.chromium.org/ui/p/webrtc/builders/perf/Perf%20Fuchsia/691/overview
https://ci.chromium.org/ui/p/webrtc/builders/perf/Perf%20Fuchsia/687/overview

Change-Id: I4173dce1086d9266683c89156aa21ffb206a00e7
Bug: None
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/299042
Commit-Queue: Jeremy Leconte <jleconte@google.com>
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#39682}

infra/config/config.star

@@ -602,8 +602,9 @@ def perf_builder(name, perf_cat, **kwargs):
     properties = make_reclient_properties("rbe-webrtc-trusted")
     properties["builder_group"] = "client.webrtc.perf"
     dimensions = {"pool": "luci.webrtc.perf", "os": "Linux", "cores": "2"}
-    if "Android" in name:
+    if "Android" in name or "Fuchsia" in name:
         # Android perf testers require more performant bots to finish under 3 hours.
+        # Fuchsia perf testers encountered "no space left on device" error on multiple runs.
         dimensions["cores"] = "8"
     return webrtc_builder(
         name = name,

infra/config/cr-buildbucket.cfg

@@ -2445,7 +2445,7 @@ buckets {
       name: "Perf Fuchsia"
       swarming_host: "chromium-swarm.appspot.com"
       swarming_tags: "vpython:native-python-wrapper"
-      dimensions: "cores:2"
+      dimensions: "cores:8"
       dimensions: "os:Linux"
       dimensions: "pool:luci.webrtc.perf"
       exe {