Set filter_terrain_svg as experimental in rep_perf_tests

This story has been disabled before on windows. This change sets the
story to experimental, so that representative perf tests would run the
test without checking the values. This helps us know if the story needs
a new upper limit, and what is this new upper limit.

Bug: chromium:1053614
Change-Id: I697f4e3d2a2fd546bcb4e5b4caf4a71d0e9cf7d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208294Reviewed-by: John Chen <johnchen@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Behdad Bakhshinategh <behdadb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771107}

testing/scripts/representative_perf_test_data/representatives_frame_times_upper_limit.json

@@ -6,7 +6,9 @@
     },
     "filter_terrain_svg": {
       "ci_095": 0.377,
-      "avg": 31.486
+      "avg": 31.486,
+      "experimental": true,
+      "_comment": "crbug.com/1053614"
     },
     "web_animation_value_type_transform_complex": {
       "ci_095": 1.783,

tools/perf/expectations.config

@@ -226,7 +226,6 @@ crbug.com/755556 [ mac ] rendering.desktop/mix_blend_mode_animation_hue [ Skip ]
 crbug.com/1017244 [ desktop ] rendering.desktop/youtube_2018 [ Skip ]
 crbug.com/1017244 [ desktop ] rendering.desktop/youtube_pinch_2018 [ Skip ]
 crbug.com/1044962 [ win ] rendering.desktop/camera_to_webgl [ Skip ]
-crbug.com/1053614 [ win ] rendering.desktop/filter_terrain_svg [ Skip ]
 
 # Benchmark: rendering.mobile
 crbug.com/785485 [ android-webview ] rendering.mobile/kevs_3d [ Skip ]