infra: Migrate builders to Goma RBE (Week 3c)

CI/try builders migrated:
- mac-code-coverage-generation
- mac-hermetic-upgrade-rel
- mac-mojo-rel
- mac-osxbeta-rel
- Mac Builder / mac-rel, mac_chromium_10.12_rel_ng, mac_chromium_10.10,
    mac_chromium_compile_rel_ng
- Mac Builder (dbg) / mac_chromium_dbg_ng, mac_chromium_compile_dbg_ng
- GPU Mac Builder / mac-rel

See migration schedule of when this is expected to land:
https://docs.google.com/spreadsheets/d/1TZhpasm6iceYm7zqkyEtZ1wn9ZcpREfH4LV4cusICJA/edit#gid=0

Bug: 950413
Change-Id: Id8393aef0b885a3e73bbf68ebffe15d1256e9cc8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1780983Reviewed-by: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Simon Que <sque@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696300}

infra/config/cr-buildbucket.cfg

@@ -1984,12 +1984,14 @@ buckets {
       name: "mac-mojo-rel"
       mixins: "mac"
       mixins: "fyi-ci"
+      mixins: "goma-rbe-prod"
       dimensions: "cores:4"
     }
 
     builders {
       name: "Mac Builder"
       mixins: "mac-ci"
+      mixins: "goma-rbe-prod"
       dimensions:"os:Mac-10.13"
     }
     builders {
@@ -2017,6 +2019,7 @@ buckets {
     builders {
       name: "Mac Builder (dbg)"
       mixins: "mac-ci"
+      mixins: "goma-rbe-prod"
     }
     builders {
       name: "Mac10.13 Tests (dbg)"
@@ -2030,6 +2033,7 @@ buckets {
     builders {
       name: "GPU Mac Builder"
       mixins: "mac-gpu-ci"
+      mixins: "goma-rbe-prod"
     }
     builders {
       name: "Mac Release (Intel)"
@@ -2684,6 +2688,7 @@ buckets {
       name: "mac-code-coverage-generation"
       mixins: "code-coverage"
       mixins: "clang-coverage"
+      mixins: "goma-rbe-prod"
       dimensions: "cores:24"
     }
     builders {
@@ -3137,10 +3142,12 @@ buckets {
       name: "mac-hermetic-upgrade-rel"
       dimensions: "os:Mac-10.13"
       mixins: "fyi-ci"
+      mixins: "goma-rbe-prod"
     }
     builders {
       name: "mac-osxbeta-rel"
       mixins: "fyi-ci"
+      mixins: "goma-rbe-prod"
       # This is launching & collecting entirely isolated tests.
       # OS shouldn't matter.
       mixins: "linux-xenial"
@@ -4759,8 +4766,16 @@ buckets {
     # NOTE: the folliwing 3 trybots aren't sensitive to Mac version on which
     # they are built, hence no additional dimension is specified.
     # The 10.xx version translates to which bots will run isolated tests.
-    builders { mixins: "mac-try" name: "mac_chromium_10.10" }
-    builders { mixins: "mac-try" name: "mac_chromium_10.12_rel_ng" }
+    builders {
+      mixins: "mac-try"
+      mixins: "goma-rbe-prod"
+      name: "mac_chromium_10.10"
+    }
+    builders {
+      mixins: "mac-try"
+      mixins: "goma-rbe-prod"
+      name: "mac_chromium_10.12_rel_ng"
+    }
     builders {
       mixins: "mac-try"
       mixins: "goma-rbe-prod"
@@ -4774,17 +4789,25 @@ buckets {
     }
     builders {
       mixins: "mac-try"
-      mixins: "goma-j150"
+      mixins: "goma-rbe-prod-j150"
       mixins: "builderless"
       name: "mac_chromium_compile_dbg_ng"
       dimensions:"os:Mac-10.13"
       dimensions:"ssd:1"
     }
-    builders { mixins: "mac-try" name: "mac_chromium_compile_rel_ng" }
-    builders { mixins: "mac-try" name: "mac_chromium_dbg_ng" }
     builders {
       mixins: "mac-try"
-      mixins: "goma-j150"
+      mixins: "goma-rbe-prod"
+      name: "mac_chromium_compile_rel_ng"
+    }
+    builders {
+      mixins: "mac-try"
+      mixins: "goma-rbe-prod"
+      name: "mac_chromium_dbg_ng"
+    }
+    builders {
+      mixins: "mac-try"
+      mixins: "goma-rbe-prod-j150"
       name: "mac-rel"
     }
     builders {

infra/config/luci-milo.cfg

@@ -3205,6 +3205,45 @@ consoles {
     category: "week3b|linux"
     short_name: "pie"
   }
+  builders: {
+    name: "buildbucket/luci.chromium.ci/mac-code-coverage-generation"
+    category: "week3c|mac"
+    short_name: "code"
+  }
+  builders {
+    name: "buildbucket/luci.chromium.ci/mac-hermetic-upgrade-rel"
+    category: "week3c|mac"
+    short_name: "herm"
+  }
+  builders {
+    name: "buildbucket/luci.chromium.ci/mac-jumbo-rel"
+    category: "week3c|mac"
+    short_name: "jumbo"
+  }
+  builders {
+    name: "buildbucket/luci.chromium.ci/mac-mojo-rel"
+    category: "week3c|mac"
+    short_name: "mojo"
+  }
+  builders {
+    name: "buildbucket/luci.chromium.ci/mac-osxbeta-rel"
+    category: "week3c|mac"
+    short_name: "osx"
+  }
+  builders {
+    name: "buildbucket/luci.chromium.ci/Mac Builder"
+    category: "week3c|mac"
+  }
+  builders {
+    name: "buildbucket/luci.chromium.ci/Mac Builder (dbg)"
+    category: "week3c|mac"
+    short_name: "dbg"
+  }
+  builders {
+    name: "buildbucket/luci.chromium.ci/GPU Mac Builder"
+    category: "week3c|mac"
+    short_name: "gpu"
+  }
   builders {
     name: "buildbucket/luci.chromium.ci/Libfuzzer Upload Linux ASan"
     category: "week4|linux"