[luci-scheduler] Add max_concurrent_invocations to chromium.lkgr builders

This adds max_concurrent_invocations on a per-builder basis for chromium.lkgr builders.

Bug: 840631
Change-Id: Id45281695c35b7d0f1549183ac5e72fd8e5ae957
Reviewed-on: https://chromium-review.googlesource.com/1073925Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Ryan Tseng <hinoka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562028}

infra/config/global/luci-scheduler.cfg

@@ -1959,6 +1959,11 @@ job {
   }
 }
 
+################################################################################
+# Jobs below are managed by luci-check.  If you wish to change them, please
+# copy/paste them above this section.
+################################################################################
+
 job {
   id: "ASAN Debug"
   acl_sets: "default"
@@ -1967,6 +1972,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "ASAN Debug"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 4
+  }
 }
 
 job {
@@ -1977,6 +1985,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "ASAN Release"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 5
+  }
 }
 
 job {
@@ -1987,6 +1998,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "ASAN Release Media"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 4
+  }
 }
 
 job {
@@ -1997,6 +2011,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "ASan Debug (32-bit x86 with V8-ARM)"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 4
+  }
 }
 
 job {
@@ -2007,6 +2024,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "ASan Release (32-bit x86 with V8-ARM)"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 4
+  }
 }
 
 job {
@@ -2017,6 +2037,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "ASan Release Media (32-bit x86 with V8-ARM)"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 4
+  }
 }
 
 job {
@@ -2302,6 +2325,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "ChromiumOS ASAN Release"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 6
+  }
 }
 
 job {
@@ -2636,6 +2662,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "MSAN Release (chained origins)"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 4
+  }
 }
 
 job {
@@ -2646,6 +2675,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "MSAN Release (no origins)"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 4
+  }
 }
 
 job {
@@ -2676,6 +2708,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "Mac ASAN Debug"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 2
+  }
 }
 
 job {
@@ -2686,6 +2721,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "Mac ASAN Release"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 2
+  }
 }
 
 job {
@@ -2696,6 +2734,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "Mac ASAN Release Media"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 2
+  }
 }
 
 job {
@@ -2977,6 +3018,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "TSAN Debug"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 4
+  }
 }
 
 job {
@@ -2987,6 +3031,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "TSAN Release"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 3
+  }
 }
 
 job {
@@ -2997,6 +3044,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "UBSan Release"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 4
+  }
 }
 
 job {
@@ -3007,6 +3057,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "UBSan vptr Release"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 4
+  }
 }
 
 job {
@@ -3245,6 +3298,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "Win ASan Release"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 7
+  }
 }
 
 job {
@@ -3255,6 +3311,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "Win ASan Release Media"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 6
+  }
 }
 
 job {