Add filter to coverage experiment bot for flaky test.

V8PlatformAllocatorBTITest.VerifyReadWriteExecutePagesAreNotProtected
test is flaky on arm64 when native coverage is turned on.

Bug: 1182468
Change-Id: I49807d71d0ce34ddfdc186293cb6f19040893932
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4133885
Reviewed-by: Haiyang Pan <[email protected]>
Commit-Queue: Benjamin Joyce (Ben) <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1088466}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index 5412239..07a21de 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -2116,6 +2116,12 @@
       'Linux Chromium OS ASan LSan Tests (1)',  # https://crbug.com/831667
     ],
     'modifications': {
+      'android-pie-arm64-coverage-experimental-rel': {
+        'args': [
+          # https://crbug.com/1404782
+          '--test-launcher-filter-file=../../testing/buildbot/filters/android.pie_arm64.gin_unittests_coverage.filter',
+        ],
+      },
       'fuchsia-fyi-x64-asan': {
         'args': [
           '--test-launcher-filter-file=../../testing/buildbot/filters/fuchsia.lsan.gin_unittests.filter',