Add mb config for blink heap trybot.

Bug: 817779
Change-Id: I49f8b897014877b152d6790d41aad25e450433a3
Reviewed-on: https://chromium-review.googlesource.com/963091Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Benjamin Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543560}

tools/mb/mb_config.pyl

@@ -616,6 +616,7 @@
       'fuchsia_x64_cast_audio': 'release_trybot_fuchsia_cast_audio',
       'layout_test_leak_detection': 'release_trybot',
       'leak_detection_linux': 'release_trybot',
+      'linux-blink-heap-verification-try': 'release_trybot_enable_blink_heap_verification',
       'linux_arm': 'release_trybot_arm',
       'linux_chromium_archive_rel_ng': 'release_bot',
       'linux_chromium_asan_rel_ng': 'asan_lsan_release_trybot',
@@ -1609,6 +1610,10 @@
       'release_trybot', 'arm',
     ],
 
+    'release_trybot_enable_blink_heap_verification': [
+      'release_trybot', 'enable_blink_heap_verification',
+    ],
+
     'release_trybot_fuchsia': [
       'release_trybot', 'fuchsia',
     ],