Add LUCI ANGLE and GPU optional trybot builders to cr-buildbucket.cfg.

BUG=815092

Change-Id: I1da2cbdabe5a3352d3653f8eed78ff9739db63b6
Reviewed-on: https://chromium-review.googlesource.com/971468Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545779}

infra/config/global/cr-buildbucket.cfg

@@ -273,6 +273,21 @@ builder_mixins {
   dimensions: "os:Windows"
 }
 
+builder_mixins {
+  name: "win-angle-try"
+  mixins: "win"
+  mixins: "angle-try"
+}
+
+builder_mixins {
+  name: "win-optional-gpu-try"
+  mixins: "win"
+  mixins: "gpu-optional-try"
+  recipe {
+    properties: "mastername:tryserver.chromium.win"
+  }
+}
+
 builder_mixins {
   name: "win-try"
   mixins: "win"
@@ -1004,6 +1019,11 @@ buckets {
     builders { mixins: "win-try" name: "win8_chromium_gn_upload" }
     builders { mixins: "win-try" name: "win7_chromium_rel_ng" }
     builders { mixins: "win-try" name: "win7_chromium_rel_loc_exp" }
+    builders { mixins: "win-angle-try" name: "win_angle_rel_ng" }
+    builders { mixins: "win-angle-try" name: "win_angle_compile_x64_rel_ng" }
+    builders { mixins: "win-angle-try" name: "win_angle_compile_x64_dbg_ng" }
+    builders { mixins: "win-angle-try" name: "win_angle_deqp_rel_ng" }
+    builders { mixins: "win-angle-try" name: "win_angle_x64_deqp_rel_ng" }
     builders { mixins: "win-try" name: "win_archive" }
     builders { mixins: "win-try" name: "win_chrome_official" }
     builders { mixins: "win-try" name: "win_chromium_compile_dbg_ng" }
@@ -1033,7 +1053,7 @@ buckets {
     builders { mixins: "win-try" name: "win_mojo" }
     builders { mixins: "win-try" name: "win_nacl_sdk" }
     builders { mixins: "win-try" name: "win_nacl_sdk_build" }
-    builders { mixins: "win-try" name: "win_optional_gpu_tests_rel" }
+    builders { mixins: "win-optional-gpu-try" name: "win_optional_gpu_tests_rel" }
     builders { mixins: "win-try" name: "win_pgo" }
     builders { mixins: "win-try" name: "win_upload_clang" }
     builders { mixins: "win-try" name: "win_x64_archive" }