Replace builder_host and builder_port with builder_type.

tools/auto_bisect/configs/mac.bisect.blink_perf.cfg

Index: tools/auto_bisect/configs/mac.bisect.blink_perf.cfg
diff --git a/tools/auto_bisect/configs/mac.bisect.blink_perf.cfg b/tools/auto_bisect/configs/mac.bisect.blink_perf.cfg
new file mode 100644
index 0000000000000000000000000000000000000000..1594d2e1fdaabd398e523f5abbb61b1b990bfbf0
--- /dev/null
+++ b/tools/auto_bisect/configs/mac.bisect.blink_perf.cfg
@@ -0,0 +1,14 @@
+# Based on http://crbug.com/420120.
+
+config = {
+  'command': 'tools/perf/run_benchmark -v --browser=release page_cycler.bloat',
+  'good_revision': '297905',
+  'bad_revision': '297940',
+  'metric': 'warm_times/page_load_time',
+  'repeat_count': '5',
+  'max_time_minutes': '5',
+  'truncate_percent': '20',
+  'builder_type': 'perf',
+}
+
+# Workaround git try issue, see crbug.com/257689