Add ios-* CI builders to buildbucket.

BUG=790168
R=dpranke@chromium.org

Change-Id: I7f6f95fba735ed2e317ee228ef21c5b78f1ff3b8
Reviewed-on: https://chromium-review.googlesource.com/1006155Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Commit-Queue: Sergey Berezin <sergeyberezin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549980}

infra/config/global/cr-buildbucket.cfg

@@ -282,6 +282,22 @@ builder_mixins {
   }
 }
 
+builder_mixins {
+  name: "ios-ci"
+  mixins: "mac-ci"
+  recipe {
+    name: "ios/unified_builder_tester"
+  }
+}
+
+builder_mixins {
+  name: "ios-try"
+  mixins: "mac-try"
+  recipe {
+    name: "ios/try"
+  }
+}
+
 builder_mixins {
   name: "mac-gpu-ci"
   mixins: "mac"
@@ -817,6 +833,14 @@ buckets {
       mixins: "mac-gpu-fyi-ci"
     }
 
+    # iOS bots.
+    builders { mixins: "ios-ci" name: "ios-device" }
+    builders { mixins: "ios-ci" name: "ios-device-xcode-clang" }
+    builders { mixins: "ios-ci" name: "ios-simulator" }
+    builders { mixins: "ios-ci" name: "ios-simulator-full-configs" }
+    builders { mixins: "ios-ci" name: "ios-simulator-xcode-clang" }
+    builders { mixins: "ios-ci" mixins: "fyi-ci" name: "ios-simulator-cronet" }
+
     # Win bots.
     builders {
       name: "Win Builder"
@@ -1166,12 +1190,12 @@ buckets {
     builders { mixins: "linux-try" name: "linux_site_isolation" }
     builders { mixins: "linux-try" name: "linux_upload_clang" }
 
-    builders { mixins: "mac-try" name: "ios-device" }
-    builders { mixins: "mac-try" name: "ios-device-xcode-clang" }
-    builders { mixins: "mac-try" name: "ios-simulator" }
-    builders { mixins: "mac-try" name: "ios-simulator-cronet" }
-    builders { mixins: "mac-try" name: "ios-simulator-eg" }
-    builders { mixins: "mac-try" name: "ios-simulator-xcode-clang" }
+    builders { mixins: "ios-try" name: "ios-device" }
+    builders { mixins: "ios-try" name: "ios-device-xcode-clang" }
+    builders { mixins: "ios-try" name: "ios-simulator" }
+    builders { mixins: "ios-try" name: "ios-simulator-cronet" }
+    builders { mixins: "ios-try" name: "ios-simulator-eg" }
+    builders { mixins: "ios-try" name: "ios-simulator-xcode-clang" }
     builders { mixins: "mac-angle-try" name: "mac_angle_compile_dbg_ng" }
     builders { mixins: "mac-angle-try" name: "mac_angle_dbg_ng" }
     builders { mixins: "mac-angle-try" name: "mac_angle_rel_ng" }