Increase P emulator chrome_public_test_apk shards

Bug: 1230192
Change-Id: I19675a792806b1d7453ed58b0555a6556da84528
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3036443
Reviewed-by: Haiyang Pan <[email protected]>
Commit-Queue: Sky Malice <[email protected]>
Cr-Commit-Position: refs/heads/master@{#902839}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index 7934b35..124e7e1 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -993,6 +993,8 @@
               'machine_type': 'n1-standard-8', # use 8-core to shorten runtime
             },
           ],
+          # See https://crbug.com/1230192, runs of 40-60 minutes at 20 shards.
+          'shards': 30,
         },
       },
     },