[omnibox] [rich-autocompletion] Add fieldtrial_testing_config.json entry

Bug: 1062446
Change-Id: Ia983fd212354e0161f2a3f637b2fda2aa8e11ecb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505895
Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Cr-Commit-Position: refs/heads/master@{#822023}

testing/variations/fieldtrial_testing_config.json

@@ -4707,6 +4707,8 @@
                         "OmniboxDynamicMaxAutocompleteUrlCutoff": "2",
                         "OmniboxLocalZeroSuggestAgeThreshold": "7",
                         "OmniboxMaxURLMatches": "7",
+                        "RichAutocompletionAutocompleteNonPrefixAll": "true",
+                        "RichAutocompletionAutocompleteTitles": "true",
                         "UIMaxAutocompleteMatches": "8"
                     },
                     "enable_features": [
@@ -4721,6 +4723,7 @@
                         "OmniboxReactiveZeroSuggestionsOnNTPOmnibox",
                         "OmniboxReactiveZeroSuggestionsOnNTPRealbox",
                         "OmniboxRemoveSuggestionsFromClipboard",
+                        "OmniboxRichAutocompletion",
                         "OmniboxRichEntitySuggestions",
                         "OmniboxTrendingZeroPrefixSuggestionsOnNTP",
                         "OmniboxUIExperimentMaxAutocompleteMatches",