Change NTP query tiles testing config to support more trending tiles

Finch config change: cl/352943943
This CL also cleans up some testing configs, leaving only the one that
are most likely to be launched.

Change-Id: I9da17f9838b9d666cdd2f6f8993c3a189cc5ca38
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2641812Reviewed-by: Weilun Shi <sweilun@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846227}

testing/variations/fieldtrial_testing_config.json

@@ -5262,75 +5262,13 @@
             ],
             "experiments": [
                 {
-                    "name": "EnabledNTPWithExploreAndTrending_20201207",
+                    "name": "EnabledNTPWithExploreAndTrending",
                     "params": {
                         "base_url": "https://chromeupboarding-pa.googleapis.com",
-                        "experiment_tag": "{maxLevels : 1, enableTrending : true}",
-                        "image_prefetch_mode": "top",
-                        "is_unmetered_network_required": "false",
-                        "most_visited_max_rows_normal_screen": "1",
-                        "most_visited_max_rows_small_screen": "1",
-                        "small_screen_height_threshold_dp": "700"
-                    },
-                    "enable_features": [
-                        "QueryTiles",
-                        "QueryTilesInNTP",
-                        "QueryTilesLocalOrdering"
-                    ],
-                    "disable_features": [
-                        "QueryTilesEnableQueryEditing",
-                        "QueryTilesInOmnibox"
-                    ]
-                },
-                {
-                    "name": "EnabledNTPWithExplore_20201207",
-                    "params": {
-                        "base_url": "https://chromeupboarding-pa.googleapis.com",
-                        "experiment_tag": "{maxLevels : 1}",
-                        "image_prefetch_mode": "top",
-                        "is_unmetered_network_required": "false",
-                        "most_visited_max_rows_normal_screen": "1",
-                        "most_visited_max_rows_small_screen": "1",
-                        "small_screen_height_threshold_dp": "700"
-                    },
-                    "enable_features": [
-                        "QueryTiles",
-                        "QueryTilesInNTP",
-                        "QueryTilesLocalOrdering"
-                    ],
-                    "disable_features": [
-                        "QueryTilesEnableQueryEditing",
-                        "QueryTilesInOmnibox"
-                    ]
-                },
-                {
-                    "name": "EnabledNTPWithStitchAndTrending_20201207",
-                    "params": {
-                        "base_url": "https://chromeupboarding-pa.googleapis.com",
-                        "experiment_tag": "{enableTrending : true}",
-                        "image_prefetch_mode": "top",
-                        "is_unmetered_network_required": "false",
-                        "most_visited_max_rows_normal_screen": "1",
-                        "most_visited_max_rows_small_screen": "1",
-                        "small_screen_height_threshold_dp": "700"
-                    },
-                    "enable_features": [
-                        "QueryTiles",
-                        "QueryTilesInNTP",
-                        "QueryTilesLocalOrdering"
-                    ],
-                    "disable_features": [
-                        "QueryTilesEnableQueryEditing",
-                        "QueryTilesInOmnibox"
-                    ]
-                },
-                {
-                    "name": "EnabledNTPWithStitch_20201207",
-                    "params": {
-                        "base_url": "https://chromeupboarding-pa.googleapis.com",
-                        "experiment_tag": "",
+                        "experiment_tag": "{maxLevels : 1, enableTrending : true, maxTrendingQueries : 8}",
                         "image_prefetch_mode": "top",
                         "is_unmetered_network_required": "false",
+                        "max_trending_tile_impressions": "1",
                         "most_visited_max_rows_normal_screen": "1",
                         "most_visited_max_rows_small_screen": "1",
                         "small_screen_height_threshold_dp": "700"
@@ -5338,7 +5276,8 @@
                     "enable_features": [
                         "QueryTiles",
                         "QueryTilesInNTP",
-                        "QueryTilesLocalOrdering"
+                        "QueryTilesLocalOrdering",
+                        "QueryTilesRemoveTrendingAfterInactivity"
                     ],
                     "disable_features": [
                         "QueryTilesEnableQueryEditing",