Put 10% of ART run-tests in `TEST_MAPPING` group `mainline-presubmit`.

Include more ART run-tests into the `mainline-presubmit` test
group. This progressive rollout is to make sure introducing ART
run-tests to this test group won't disturb/break Android
presubmits.

Output of `art/test/utils/regen-test-files`:

  $ art/test/utils/regen-test-files
  Generated Blueprint files for 621 ART run-tests out of 919 (67%).
  Generated TEST_MAPPING entries for 379 ART run-tests out of 919 (41%):
    37 tests (10%) in `mainline-presubmit` test group.
    189 tests (50%) in `presubmit` test group.
    190 tests (50%) in `postsubmit` test group.

Test: atest --test-mapping art:mainline-presubmit
Bug: 178703264
Bug: 152374989
Change-Id: I9dff31c5044583856d1586a437fdf35dd437a8df
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 36bf4c2..ba77c64 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -54,6 +54,63 @@
     },
     {
       "name": "art-run-test-019-wrong-array-type[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-020-string[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-021-string2[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-022-interface[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-025-access-controller[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-026-access[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-027-arithmetic[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-028-array-write[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-029-assert[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-033-class-init-deadlock[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-035-enum[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-036-finalizer[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-037-inherit[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-039-join-main[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-040-miranda[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-041-narrowing[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-043-privates[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-045-reflect-array[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-046-reflect[com.google.android.art.apex]"
+    },
+    {
+      "name": "art-run-test-047-returns[com.google.android.art.apex]"
     }
   ],
   "presubmit": [
diff --git a/test/utils/regen-test-files b/test/utils/regen-test-files
index d8efc56..43cbaac 100755
--- a/test/utils/regen-test-files
+++ b/test/utils/regen-test-files
@@ -389,7 +389,7 @@
 # Percentage of ART run-tests (among the ones expected to succeed) to include in
 # the `mainline-presubmit` test group in `TEST_MAPPING` file.
 # This value has to be a number between 0 and 100.
-mainline_presubmit_tests_percentage = 5
+mainline_presubmit_tests_percentage = 10
 
 
 # Is `run_test` a Checker test (i.e. a test containing Checker