blink_perf.parser: Reduce how much we recurse

Some of these tests caused blink to recurse to stacks > 4,000 frames
deep. This caused crashes for Android on ARM64, which has a standard
stack limit of 1MB.

Since it appears that these benchmarks' depths are somewhat arbitrary
(e.g. the crashes that we're seeing when running these benchmarks aren't
indicative of a problem in the real world), turning down the recursion
seems reasonable here.

New limits were chosen arbitrarily.

Bug: 851539
Test: Ran blink_perf.parser on ARM64 Android; no crashes observed.
Change-Id: I310b5e92fcb32524ec6e1c8a1c67226d68f4e5aa
Reviewed-on: https://chromium-review.googlesource.com/1111685
Commit-Queue: George Burgess <gbiv@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569720}

third_party/blink/perf_tests/parser/query-selector-all-class-deep.html

@@ -4,7 +4,7 @@
 <script src="../resources/runner.js"></script>
 <script>
 var parentDiv = document.body;
-for (var i = 0; i < 1000; i++) {
+for (var i = 0; i < 500; i++) {
     var div = document.createElement("div");
     div.id = "foo" + i;
     div.className = "bar" + i;

third_party/blink/perf_tests/parser/query-selector-all-deep.html

@@ -4,7 +4,7 @@
 <script src="../resources/runner.js"></script>
 <script>
 var parentDiv = document.body;
-for (var i = 0; i < 1000; i++) {
+for (var i = 0; i < 500; i++) {
     var div = document.createElement("div");
     div.id = "foo" + i;
     div.className = "bar" + i;

third_party/blink/perf_tests/parser/query-selector-all-id-deep.html

@@ -4,7 +4,7 @@
 <script src="../resources/runner.js"></script>
 <script>
 var parentDiv = document.body;
-for (var i = 0; i < 1000; i++) {
+for (var i = 0; i < 500; i++) {
     var div = document.createElement("div");
     div.id = "foo" + i;
     div.className = "bar" + i;