[autoroll] Add libunwind => Chromium roller.

Possible after https://chromium-review.googlesource.com/c/chromium/src/+/2713283

Bug: chromium:1177288
Change-Id: Idd76cf654f481a4df9ac772190765482287f7e77
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/374122
Auto-Submit: Nico Weber <thakis@chromium.org>
Commit-Queue: Eric Boren <borenet@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
diff --git a/autoroll/config/libunwind-chromium.cfg b/autoroll/config/libunwind-chromium.cfg
new file mode 100644
index 0000000..a9f9e3c
--- /dev/null
+++ b/autoroll/config/libunwind-chromium.cfg
@@ -0,0 +1,60 @@
+# See https://skia.googlesource.com/buildbot.git/+show/master/autoroll/go/config/config.proto
+# for the structure of this file.
+
+roller_name:  "libunwind-chromium"
+child_display_name:  "libunwind"
+parent_display_name:  "Chromium"
+parent_waterfall:  "https://build.chromium.org"
+owner_primary:  "borenet"
+owner_secondary:  "rmistry"
+contacts:  "thakis@chromium.org"
+contacts:  "rnk@chromium.org"
+service_account:  "chromium-autoroll@skia-public.iam.gserviceaccount.com"
+reviewer:  "thakis@chromium.org"
+reviewer:  "rnk@chromium.org"
+roll_cooldown:  "24h"
+commit_msg:  {
+  child_log_url_tmpl:  "https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libunwind.git/+log/{{.RollingFrom}}..{{.RollingTo}}"
+  include_log:  true
+  include_revision_count:  true
+  include_tbr_line:  true
+  include_tests:  true
+  built_in:  DEFAULT
+}
+gerrit:  {
+  url:  "https://chromium-review.googlesource.com"
+  project:  "chromium/src"
+  config:  CHROMIUM_BOT_COMMIT
+}
+kubernetes:  {
+  cpu:  "1"
+  memory:  "2Gi"
+  readiness_failure_threshold:  10
+  readiness_initial_delay_seconds:  30
+  readiness_period_seconds:  30
+}
+parent_child_repo_manager:  {
+  gitiles_parent:  {
+    gitiles:  {
+      branch:  "master"
+      repo_url:  "https://chromium.googlesource.com/chromium/src.git"
+    }
+    dep:  {
+      primary:  {
+        id:  "https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libunwind.git"
+        path:  "DEPS"
+      }
+    }
+    gerrit:  {
+      url:  "https://chromium-review.googlesource.com"
+      project:  "chromium/src"
+      config:  CHROMIUM_BOT_COMMIT
+    }
+  }
+  gitiles_child:  {
+    gitiles:  {
+      branch:  "master"
+      repo_url:  "https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libunwind.git"
+    }
+  }
+}