Add TabToGTSAnimation params to fieldtrial_testing_config

Bug: 964406
Change-Id: I1a6f0969d6361afb00a5f5a4d800c4ad29ff7b8b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1735777
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684336}

testing/variations/fieldtrial_testing_config.json

@@ -5404,6 +5404,10 @@
             "experiments": [
                 {
                     "name": "Enabled",
+                    "params": {
+                        "zooming-min-memory-mb": "2048",
+                        "zooming-min-sdk-version": "23"
+                    },
                     "enable_features": [
                         "TabToGTSAnimation"
                     ]