Add basic targets for presubmit using ci.bazel.io.

Change-Id: Ia52e799cda0dcd4d94745845c8999f363fd1fb36
diff --git a/WORKSPACE b/WORKSPACE
index 9c3f0db..67f087d 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -87,7 +87,7 @@
     name = "bazel_apt",
     package_prefix = "http://storage.googleapis.com/bazel-apt/",
     packages_gz_url = "http://storage.googleapis.com/bazel-apt/dists/stable/jdk1.8/binary-amd64/Packages.gz",
-    sha256 = "e0d017cc11e5a8f18383073018194a4546ab43c3508c708db63deeffa0e0719c",
+    sha256 = "1bbbd6dcd8f5b4e354a7742b24983bfa997b31d7a02093783833b910197526f4",
 )
 
 dpkg_src(
diff --git a/scripts/ci/bazel-toolchains.json b/scripts/ci/bazel-toolchains.json
new file mode 100644
index 0000000..39596fe
--- /dev/null
+++ b/scripts/ci/bazel-toolchains.json
@@ -0,0 +1,20 @@
+[
+  {
+    "configurations": [
+      {"node": "linux-x86_64"},
+      {"node": "ubuntu_16.04-x86_64"}
+    ],
+    "parameters": {
+      "build_opts": [
+        "--verbose_failures"
+      ],
+      "targets": [
+        "//rules:debian8-clang-0.7.0-autoconfig",
+        "//rules:trusty-gcc-0.7.0-autoconfig",
+        "//rules:xenial-gcc-0.7.0-autoconfig"
+      ],
+      "tests": [],
+    },
+  }
+]
+