infra: Add and use mixins for Goma RBE server settings

R=tikuta@chromium.org, ukai@chromium.org, yyanagisawa@chromium.org

Bug: 945701
Change-Id: I98b2a8a2d644eccde84224171bbe7e9885041046
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1539416
Commit-Queue: Simon Que <sque@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644219}

infra/config/cr-buildbucket.cfg

@@ -135,6 +135,46 @@ builder_mixins {
   }
 }
 
+# Enables use of Goma RBE ToT backend in a builder.
+builder_mixins {
+  name: "goma-rbe-tot"
+  recipe {
+    properties_j: <<END
+    $build/goma: {
+      "server_host": "rbe-tot.endpoints.cxx-compiler-service.cloud.goog"
+    }
+    END
+  }
+}
+
+# Enables use of Goma RBE Mixer Staging backend in a builder.
+builder_mixins {
+  name: "goma-rbe-mixer-staging"
+  recipe {
+    properties_j: <<END
+    $build/goma: {
+      "server_host": "staging-goma.chromium.org",
+      "rpc_extra_params": "?staging"
+    }
+    END
+  }
+}
+
+# TODO(ukai): add goma-rbe-mixer-prod
+
+# Enables use of Goma RBE Prod backend in a builder.
+builder_mixins {
+  name: "goma-rbe-prod"
+  recipe {
+    properties_j: <<END
+    $build/goma: {
+      "server_host": "goma.chromium.org",
+      "rpc_extra_params": "?prod"
+    }
+    END
+  }
+}
+
 builder_mixins {
   name: "android"
   dimensions: "os:Android"
@@ -2527,6 +2567,7 @@ buckets {
       dimensions: "os:Ubuntu-14.04"
       mixins: "experimental"
       mixins: "goma-ci"
+      mixins: "goma-rbe-tot"
     }
     builders {
       name: "Chromium Linux Goma RBE ToT (ATS)"
@@ -2534,54 +2575,63 @@ buckets {
       mixins: "experimental"
       mixins: "goma-ats"
       mixins: "goma-ci"
+      mixins: "goma-rbe-tot"
     }
     builders {
       name: "Chromium Linux Goma RBE Staging"
       dimensions: "os:Ubuntu-14.04"
       mixins: "experimental"
       mixins: "goma-ci"
+      mixins: "goma-rbe-mixer-staging"
     }
     builders {
       name: "Chromium Linux Goma RBE Staging (clobber)"
       dimensions: "os:Ubuntu-14.04"
       mixins: "experimental"
       mixins: "goma-ci"
+      mixins: "goma-rbe-mixer-staging"
     }
     builders {
       name: "Chromium Linux Goma RBE Staging (dbg)"
       dimensions: "os:Ubuntu-14.04"
       mixins: "experimental"
       mixins: "goma-ci"
+      mixins: "goma-rbe-mixer-staging"
     }
     builders {
       name: "Chromium Linux Goma RBE Staging (dbg) (clobber)"
       dimensions: "os:Ubuntu-14.04"
       mixins: "experimental"
       mixins: "goma-ci"
+      mixins: "goma-rbe-mixer-staging"
     }
     builders {
       name: "Chromium Linux Goma RBE Prod"
       dimensions: "os:Ubuntu-14.04"
       mixins: "experimental"
       mixins: "goma-ci"
+      mixins: "goma-rbe-prod"
     }
     builders {
       name: "Chromium Linux Goma RBE Prod (clobber)"
       dimensions: "os:Ubuntu-14.04"
       mixins: "experimental"
       mixins: "goma-ci"
+      mixins: "goma-rbe-prod"
     }
     builders {
       name: "Chromium Linux Goma RBE Prod (dbg)"
       dimensions: "os:Ubuntu-14.04"
       mixins: "experimental"
       mixins: "goma-ci"
+      mixins: "goma-rbe-prod"
     }
     builders {
       name: "Chromium Linux Goma RBE Prod (dbg) (clobber)"
       dimensions: "os:Ubuntu-14.04"
       mixins: "experimental"
       mixins: "goma-ci"
+      mixins: "goma-rbe-prod"
     }
     builders {
       name: "Chromium Mac Goma RBE ToT"
@@ -2590,6 +2640,7 @@ buckets {
       mixins: "experimental"
       mixins: "goma-ci"
       mixins: "goma-j80"
+      mixins: "goma-rbe-tot"
     }
     builders {
       name: "Chromium Mac Goma RBE Staging (clobber)"
@@ -2598,6 +2649,7 @@ buckets {
       mixins: "experimental"
       mixins: "goma-ci"
       mixins: "goma-j80"
+      mixins: "goma-rbe-mixer-staging"
     }
     builders {
       name: "Chromium Mac Goma RBE Staging"
@@ -2606,6 +2658,7 @@ buckets {
       mixins: "experimental"
       mixins: "goma-ci"
       mixins: "goma-j80"
+      mixins: "goma-rbe-mixer-staging"
     }
     builders {
       name: "Chromium Mac Goma RBE Staging (dbg)"
@@ -2614,6 +2667,7 @@ buckets {
       mixins: "experimental"
       mixins: "goma-ci"
       mixins: "goma-j80"
+      mixins: "goma-rbe-mixer-staging"
     }
     builders {
       name: "Chromium Win Goma RBE ToT"
@@ -2621,6 +2675,7 @@ buckets {
       mixins: "experimental"
       mixins: "goma-ats"
       mixins: "goma-ci"
+      mixins: "goma-rbe-tot"
     }
     builders {
       name: "Chromium Win Goma RBE Staging"
@@ -2628,6 +2683,7 @@ buckets {
       mixins: "experimental"
       mixins: "goma-ats"
       mixins: "goma-ci"
+      mixins: "goma-rbe-mixer-staging"
     }
     builders {
       name: "Chromium Win Goma RBE Staging (clobber)"
@@ -2635,12 +2691,14 @@ buckets {
       mixins: "experimental"
       mixins: "goma-ats"
       mixins: "goma-ci"
+      mixins: "goma-rbe-mixer-staging"
     }
     builders {
       name: "Chromium Android ARM 32-bit Goma RBE ToT"
       dimensions: "os:Ubuntu-14.04"
       mixins: "experimental"
       mixins: "goma-ci"
+      mixins: "goma-rbe-tot"
     }
     builders {
       name: "Chromium Android ARM 32-bit Goma RBE ToT (ATS)"
@@ -2648,36 +2706,42 @@ buckets {
       mixins: "experimental"
       mixins: "goma-ats"
       mixins: "goma-ci"
+      mixins: "goma-rbe-tot"
     }
     builders {
       name: "Chromium Android ARM 32-bit Goma RBE Staging"
       dimensions: "os:Ubuntu-14.04"
       mixins: "experimental"
       mixins: "goma-ci"
+      mixins: "goma-rbe-mixer-staging"
     }
     builders {
       name: "Chromium Android ARM 32-bit Goma RBE Prod"
       dimensions: "os:Ubuntu-14.04"
       mixins: "experimental"
       mixins: "goma-ci"
+      mixins: "goma-rbe-prod"
     }
     builders {
       name: "Chromium Android ARM 32-bit Goma RBE Prod (clobber)"
       dimensions: "os:Ubuntu-14.04"
       mixins: "experimental"
       mixins: "goma-ci"
+      mixins: "goma-rbe-prod"
     }
     builders {
       name: "Chromium Android ARM 32-bit Goma RBE Prod (dbg)"
       dimensions: "os:Ubuntu-14.04"
       mixins: "experimental"
       mixins: "goma-ci"
+      mixins: "goma-rbe-prod"
     }
     builders {
       name: "Chromium Android ARM 32-bit Goma RBE Prod (dbg) (clobber)"
       dimensions: "os:Ubuntu-14.04"
       mixins: "experimental"
       mixins: "goma-ci"
+      mixins: "goma-rbe-prod"
     }
     builders {
       name: "Chromium Mac Goma Staging"