crosperf: Filter-in exp_avg_surface_fps in rendering.desktop

Rendering.desktop benchmark which was added into crosperf does not
return results in avg_surface_fps field. Until recently it worked fine.
There is an alternative field in histograms.json "exp_avg_surface_fps"
holding the data.

Add exp_avg_surface_fps in default-telemetry-results.json to filter-in
the benchmark field in crosperf results.

BUG=chromium:1030475
TEST=crosperf with rendering.desktop returns data on chell and lulu

Change-Id: Ia1d25f7f1894ca559f1e14e032fcf274dc4df49d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/1951336
Reviewed-by: George Burgess <gbiv@chromium.org>
Tested-by: Denis Nikitin <denik@chromium.org>
diff --git a/crosperf/default-telemetry-results.json b/crosperf/default-telemetry-results.json
index b5ea45a..c4fe0d4 100644
--- a/crosperf/default-telemetry-results.json
+++ b/crosperf/default-telemetry-results.json
@@ -163,9 +163,11 @@
     "Event.Latency.ScrollUpdate.Touch.TimeToScrollUpdateSwapBegin4_avg"
   ],
   "rendering.desktop@@aquarium$": [
-    "avg_surface_fps"
+    "avg_surface_fps",
+    "exp_avg_surface_fps"
   ],
   "rendering.desktop@@aquarium_20k$": [
-    "avg_surface_fps"
+    "avg_surface_fps",
+    "exp_avg_surface_fps"
   ]
 }