[omnibox] Add entity & max suggest configs to fieldtrial_testing_config.

Adds configs for:
  - entity latency
  - dynamic max suggest
  - URL bubble max suggest

Change-Id: Ideaf90a3ca9ffcdc05f7a89f2a2ddf9f755f72d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2486398Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819009}

testing/variations/fieldtrial_testing_config.json

@@ -4710,13 +4710,19 @@
                 {
                     "name": "DesktopExperiments",
                     "params": {
+                        "EntitySuggestionsReduceLatencyDecoderWakeup": "true",
                         "MaxZeroSuggestMatches": "10",
+                        "OmniboxDynamicMaxAutocompleteIncreasedLimit": "10",
+                        "OmniboxDynamicMaxAutocompleteUrlCutoff": "2",
                         "OmniboxLocalZeroSuggestAgeThreshold": "7",
                         "OmniboxMaxURLMatches": "7",
                         "UIMaxAutocompleteMatches": "8"
                     },
                     "enable_features": [
+                        "OmniboxBubbleUrlSuggestions",
                         "OmniboxDisplayTitleForCurrentUrl",
+                        "OmniboxDynamicMaxAutocomplete",
+                        "OmniboxEntitySuggestionsReduceLatency",
                         "OmniboxLocalZeroSuggestAgeThreshold",
                         "OmniboxLocalZeroSuggestFrecencyRanking",
                         "OmniboxMaxURLMatches",