Add CI and try bots for --minor-mc

Bug: chromium:788113
Change-Id: I205c57869caa24957d63a139f6ba0c6e8cf45749
Reviewed-on: https://chromium-review.googlesource.com/800151
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49783}

infra/testing/client.v8.pyl

@@ -10,4 +10,11 @@
   # 'V8 Linux64 - debug': [
   #   {'name': 'benchmarks', 'variant': 'default', 'shards': 1},
   # ],
+
+  'V8 Linux64': [
+    {'name': 'v8testing', 'variant': 'minor_mc', 'shards': 1},
+  ],
+  'V8 Linux64 - debug': [
+    {'name': 'v8testing', 'variant': 'minor_mc', 'shards': 1},
+  ],
 }
\ No newline at end of file

infra/testing/tryserver.v8.pyl

@@ -7,4 +7,8 @@
   # 'v8_linux64_rel_ng_triggered': [
   #   {'name': 'benchmarks', 'variant': 'default', 'shards': 1},
   # ],
+
+  'v8_linux64_rel_ng_triggered': [
+    {'name': 'v8testing', 'variant': 'minor_mc', 'shards': 1},
+  ],
 }
\ No newline at end of file