Next part of merge. See TODO for details

mysql-test/suite/perfschema/include/table_io_setup_helper.inc

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+# Performance schema test template
+
+# How to use this script in a test case
+# =====================================
+#
+# The general table io test template is as follows
+#
+# --source include/not_embedded.inc
+# --source include/have_perfschema.inc
+# --source ../include/table_io_setup_helper.inc
+# ... more setup scripts as needed ...
+# update performance_schema.setup_consumers set enabled='YES';
+# ... test payload here ...
+# ... optionally, add this insert between statements
+# ... to make the final output more readable
+# insert into test.marker set a=1;
+# ... more test payload here ...
+# ... optionaly, add the following line (by default, only "test" is dumped) ...
+# let $schema_to_dump="db1", "db2", "db3";
+# --source ../include/table_io_result_helper.inc
+# Optional: Repeat several times
+#    update performance_schema.setup_consumers set enabled='YES';
+#    ... test payload here ...
+#    --source ../include/table_io_result_helper.inc
+# ... cleanup
+# --source ../include/table_io_cleanup_helper.inc
+#
+# (end of template)
+
+# Setup
+
+--disable_warnings
+drop table if exists test.marker;
+--enable_warnings
+
+# To be used in the test payload,
+# insert into marker makes the test output easier to read,
+# to separate table io events between statements.
+create table test.marker(a int);
+
+update performance_schema.setup_consumers set enabled='NO';
+
+update performance_schema.setup_instruments set enabled='NO';
+update performance_schema.setup_instruments set enabled='YES'
+  where name like "wait/io/table/%";
+
+truncate table performance_schema.events_waits_history_long;
+
+# Reset lost counters to a known state
+flush status;
+
+# Make sure there is room to instrument tables from this test.
+flush tables;
+
+# By default, dump table io only for test.
+# A test can overide this
+let $schema_to_dump="test";
+