Add initial ProtoBuf for DevToolsMessages. (#6438)

- Add devtools_message.proto file
- Create and send message in DevToolsService with the new ProtoBuf.

cc: @piotrswigon @jasonwyatt

Closes #6438

COPYBARA_INTEGRATE_REVIEW=#6438 from SHeimlich:devtools-protos 226b0ab
PiperOrigin-RevId: 339127009

java/arcs/android/devtools/BUILD

@@ -1,4 +1,9 @@
 load("//third_party/java/arcs/build_defs:build_defs.bzl", "arcs_kt_android_library")
+load(
+    "//third_party/java/arcs/build_defs:native.oss.bzl",
+    "android_proto_library",
+    "proto_library",
+)
 load("//tools/build_defs/android:rules.bzl", "android_library")
 
 licenses(["notice"])
@@ -22,6 +27,7 @@ arcs_kt_android_library(
     resource_files = glob(["res/**/*"]),
     deps = [
         ":aidl",
+        ":devtools_message_android_proto",
         "//java/arcs/android/storage",
         "//java/arcs/android/storage/service:aidl",
         "//java/arcs/core/common",
@@ -39,3 +45,16 @@ arcs_kt_android_library(
         "//third_party/kotlin/kotlinx_coroutines",
     ],
 )
+
+proto_library(
+    name = "devtools_message_proto",
+    srcs = ["devtools_message.proto"],
+    deps = [
+        "//java/arcs/android/storage:proxy_message_proto",
+    ],
+)
+
+android_proto_library(
+    name = "devtools_message_android_proto",
+    deps = [":devtools_message_proto"],
+)

java/arcs/android/devtools/DevToolsService.kt

@@ -24,6 +24,7 @@ import arcs.android.storage.decodeProxyMessage
 import arcs.android.storage.service.IDevToolsProxy
 import arcs.android.storage.service.IDevToolsProxyCallback
 import arcs.android.storage.service.IDevToolsStorageManager
+import arcs.android.storage.toProto
 import arcs.core.crdt.CrdtData
 import arcs.core.crdt.CrdtOperation
 import arcs.core.storage.ProxyMessage
@@ -79,6 +80,12 @@ open class DevToolsService : Service() {
         object : IDevToolsProxyCallback.Stub() {
           override fun onProxyMessage(proxyMessage: ByteArray, storageKey: String) {
             scope.launch {
+              val proto = DevtoolsMessage.DevToolsProxyMessageProto.newBuilder()
+                .setProxyMessage(proxyMessage.decodeProxyMessage().toProto())
+                .setStoreType(DevtoolsMessage.DevToolsProxyMessageProto.StoreType.REFERENCE_MODE)
+                .setStorageKey(storageKey)
+                .build()
+              devToolsServer.send(proto.toString())
               createAndSendProxyMessages(
                 proxyMessage.decodeProxyMessage(),
                 REFERENCEMODE,

java/arcs/android/devtools/devtools_message.proto

@@ -0,0 +1,18 @@
+syntax = "proto3";
+
+package arcs.android.devtools;
+
+import "java/arcs/android/storage/proxy_message.proto";
+
+option java_package = "arcs.android.devtools";
+
+message DevToolsProxyMessageProto {
+  arcs.android.storage.ProxyMessageProto proxy_message = 1;
+  enum StoreType {
+    DIRECT = 0;
+    REFERENCE_MODE = 1;
+  }
+
+  string storage_key = 2;
+  StoreType store_type = 3;
+}