Add Cast Android (dbg) and cast_shell_android to cr-buildbucket.cfg

Bug: 790531,731983
Change-Id: Id859a3540cdbe9798ec22af680878da71212740d
Reviewed-on: https://chromium-review.googlesource.com/1058180
Commit-Queue: Quinten Yearsley <qyearsley@chromium.org>
Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558460}

infra/config/global/cr-buildbucket.cfg

@@ -579,6 +579,12 @@ buckets {
       dimensions: "os:Ubuntu-14.04"
     }
 
+    builders {
+      name: "Cast Android (dbg)"
+      mixins: "android-ci"
+      dimensions: "os:Ubuntu-14.04"
+    }
+
     builders {
       name: "Deterministic Android"
       mixins: "android-ci"
@@ -1345,6 +1351,11 @@ buckets {
       name: "android_n5x_swarming_dbg"
       dimensions: "os:Ubuntu-14.04"
     }
+    builders {
+      mixins: "android-try"
+      name: "cast_shell_android"
+      dimensions: "os:Ubuntu-14.04"
+    }
     builders { mixins: "android-optional-gpu-try" name: "android_optional_gpu_tests_rel" }
 
     builders { mixins: "chromeos-try" name: "chromeos-amd64-generic-rel" }