Add Windows Release CI builders to buildbucket

Adds the compile builder, and the tester.

Bug: 790710, 790644
Change-Id: Ie7184a94b0ec7e518aa65a96432880529c1920c7
Reviewed-on: https://chromium-review.googlesource.com/940423Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539963}

infra/config/global/cr-buildbucket.cfg

@@ -315,12 +315,24 @@ buckets {
     }
 
     # Win bots.
+    builders {
+      name: "Win Builder"
+      mixins: "win-ci"
+      dimensions: "cpu:x86-64"
+      dimensions: "cores:32"
+    }
     builders {
       name: "Win Builder (dbg)"
       mixins: "win-ci"
       dimensions: "cpu:x86-64"
       dimensions: "cores:32"
     }
+    builders {
+      name: "Win7 Tests (1)"
+      mixins: "win-ci"
+      dimensions: "cpu:x86-64"
+      dimensions: "cores:8"
+    }
     builders {
       name: "Win7 Tests (dbg)(1)"
       mixins: "win-ci"