Add request/lock to opensource build

This is to fix Kokoro, given the directory added in [] Also, added forgotten keyring/api directory.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=167598465

java/google/registry/request/lock/BUILD

@@ -0,0 +1,16 @@
+package(
+    default_visibility = ["//visibility:public"],
+)
+
+licenses(["notice"])  # Apache 2.0
+
+java_library(
+    name = "lock",
+    srcs = glob(["*.java"]),
+    deps = [
+        "//java/google/registry/model",
+        "@com_google_code_findbugs_jsr305",
+        "@com_google_dagger",
+        "@joda_time",
+    ],
+)

java/google/registry/request/lock/LockHandler.java

@@ -0,0 +1,45 @@
+// Copyright 2017 The Nomulus Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package google.registry.request.lock;
+
+import java.io.Serializable;
+import java.util.concurrent.Callable;
+import javax.annotation.Nullable;
+import org.joda.time.Duration;
+
+/**
+ * Code execution locked on some shared resource.
+ *
+ * <p>Locks are either specific to a tld or global to the entire system, in which case a tld of
+ * null is used.
+ */
+public interface LockHandler extends Serializable {
+
+  /**
+   * Acquire one or more locks and execute a Void {@link Callable}.
+   *
+   * <p>Runs on a thread that will be killed if it doesn't complete before the lease expires.
+   *
+   * <p>Note that locks are specific either to a given tld or to the entire system (in which case
+   * tld should be passed as null).
+   *
+   * @return true if all locks were acquired and the callable was run; false otherwise.
+   */
+  public boolean executeWithLocks(
+      final Callable<Void> callable,
+      @Nullable String tld,
+      Duration leaseLength,
+      String... lockNames);
+}

java/google/registry/request/lock/LockHandlerPassthrough.java

@@ -0,0 +1,54 @@
+// Copyright 2017 The Nomulus Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package google.registry.request.lock;
+
+import google.registry.model.server.Lock;
+import java.util.concurrent.Callable;
+import javax.annotation.Nullable;
+import javax.inject.Inject;
+import org.joda.time.Duration;
+
+/**
+ * Implementation of {@link LockHandler} that uses Lock as is.
+ *
+ * This is a temporary implementation to help migrate from Lock to LockHandler. Once the migration
+ * is complete - we will create a "proper" LockHandlerImpl class and remove this one.
+ *
+ * TODO(guyben):delete this class once LockHandlerImpl is done.
+ */
+public class LockHandlerPassthrough implements LockHandler {
+
+  private static final long serialVersionUID = 6551645164118637767L;
+
+  @Inject public LockHandlerPassthrough() {}
+
+  /**
+   * Acquire one or more locks and execute a Void {@link Callable}.
+   *
+   * <p>Runs on a thread that will be killed if it doesn't complete before the lease expires.
+   *
+   * <p>This is a simple passthrough to {@link Lock#executeWithLocks}.
+   *
+   * @return true if all locks were acquired and the callable was run; false otherwise.
+   */
+  @Override
+  public boolean executeWithLocks(
+      final Callable<Void> callable,
+      @Nullable String tld,
+      Duration leaseLength,
+      String... lockNames) {
+    return Lock.executeWithLocks(callable, tld, leaseLength, lockNames);
+  }
+}