[crosperf] Fix default result for smoothness.tough_webgl_cases.

The name of the default summary field for this test has changed,
which makes crosperf fail since it can't find the right result
field.  This CL fixes that problem.

BUG=None
TEST=Tested with nightly testd on chrotomation2.

Change-Id: I049c8abd2dd30b64aec8be65feb56b31115a4921
Reviewed-on: https://chrome-internal-review.googlesource.com/249130
Commit-Ready: Caroline Tice <cmtice@google.com>
Tested-by: Caroline Tice <cmtice@google.com>
Reviewed-by: Yunlian Jiang <yunlian@google.com>
diff --git a/crosperf/default-telemetry-results.json b/crosperf/default-telemetry-results.json
index c09ebed..244f43f 100644
--- a/crosperf/default-telemetry-results.json
+++ b/crosperf/default-telemetry-results.json
@@ -9,7 +9,7 @@
     "warm_times__page_load_time"
   ], 
   "smoothness.tough_webgl_cases": [
-    "percentage_smooth__percentage_smooth"
+    "WebGLAnimation-percentage_smooth__WebGLAnimation-percentage_smooth"
   ], 
   "page_cycler.intl_es_fr_pt-BR": [
     "cold_times__page_load_time",