Dagger, meet Flows. Flows, meet Dagger.

Daggerizes all of the EPP flows. This does not change anything yet
about the flows themselves, just how they are invoked, but after
this CL it's safe to @Inject things into flow classes.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=125382478

java/google/registry/flows/FlowComponent.java

@@ -0,0 +1,35 @@
+// Copyright 2016 The Domain Registry 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.flows;
+
+import dagger.Subcomponent;
+
+import google.registry.model.eppcommon.Trid;
+
+/** Dagger component for flow classes. */
+@FlowScope
+@Subcomponent(modules = FlowModule.class)
+public interface FlowComponent {
+
+  Trid trid();
+  FlowRunner flowRunner();
+
+  /** Dagger-implemented builder for this subcomponent. */
+  @Subcomponent.Builder
+  interface Builder {
+    Builder flowModule(FlowModule flowModule);
+    FlowComponent build();
+  }
+}