[cr-buildbucket.cfg] Add cores:32 to Chromium Win/Linux bots

Bug: 790277, 790274, 790292, 790281
Change-Id: I719d67df74e137855ac3c4f5e8a6586aae07b661
Reviewed-on: https://chromium-review.googlesource.com/1090033Reviewed-by: Jao-ke Chin-Lee <jchinlee@chromium.org>
Commit-Queue: Ryan Tseng <hinoka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565101}

infra/config/global/cr-buildbucket.cfg

@@ -1525,6 +1525,7 @@ buckets {
     builders {
       name: "Win x64"
       dimensions: "os:Windows-10"
+      dimensions: "cores:32"
       mixins: "chromium-ci"
     }
     builders {
@@ -1551,6 +1552,7 @@ buckets {
     builders {
       name: "Android"
       dimensions: "os:Ubuntu-14.04"
+      dimensions: "cores:32"
       mixins: "chromium-ci"
     }
     builders {
@@ -1821,6 +1823,7 @@ buckets {
     builders {
       name: "Linux x64"
       dimensions: "os:Ubuntu-14.04"
+      dimensions: "cores:32"
       mixins: "chromium-ci"
     }
     builders {
@@ -2073,6 +2076,7 @@ buckets {
     builders {
       name: "Win"
       dimensions: "os:Windows-10"
+      dimensions: "cores:32"
       mixins: "chromium-ci"
     }
     builders {