Port ChromeSyncShell build rules to GN

sync/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
+import("//sync/protocol/protocol_sources.gni")
 import("//testing/test.gni")
 
 component("sync") {
   public_deps = [
     ":sync_core",
     "//sync/protocol",
   ]
 }
 
 # GYP version: sync/sync.gyp:sync_core
@@ skipping 818 matching lines @@
 
   # GYP: //sync/sync_tests.gypi:fake_server_jni
   generate_jni("fake_server_jni") {
     testonly = true
     jni_package = "sync/test/fake_server"
     sources = [
       "//chrome/android/sync_shell/javatests/src/org/chromium/chrome/browser/sync/FakeServerHelper.java",
     ]
   }
 
+  _test_support_sync_prepared_protos_dir =
+      "$root_gen_dir/test_support_sync_proto_java_prepare/"
+  action("test_support_sync_proto_java_prepare") {
+    script = "//sync/protocol/prepare_protos_for_java_tests.py"
+    inputs = sync_protocol_sources
+    outputs = process_file_template(
+            sync_protocol_sources,
+            [ "$_test_support_sync_prepared_protos_dir/{{source_file_part}}" ])
+    args = [
+      "--output_dir",
+      rebase_path(_test_support_sync_prepared_protos_dir, root_build_dir),
+    ]
+    args += rebase_path(sync_protocol_sources, root_build_dir)
+  }
+
+  # GYP: //sync/sync_tests.gypi:test_support_sync_proto_java
+  proto_java_library("test_support_sync_proto_java") {
+    proto_path = _test_support_sync_prepared_protos_dir
+    sources = get_target_outputs(":test_support_sync_proto_java_prepare")
+    deps = [
+      ":test_support_sync_proto_java_prepare",
+    ]
+  }
+
   # GYP: //sync/sync_tests.gypi:sync_java_test_support
   android_library("sync_java_test_support") {
     testonly = true
     deps = [
       "//base:base_java",
       "//base:base_java_test_support",
       "//third_party/jsr-305:jsr_305_javalib",
       "android:sync_java",
     ]
     DEPRECATED_java_in_dir = "test/android/javatests/src"
@@ skipping 10 matching lines @@
       ":fake_server_jni",
       ":sync_core",
       ":test_support_sync_fake_server",
       "//base",
       "//sync/protocol:protocol",
       "//testing/gtest",
       "//url:url",
     ]
   }
 }