components: Add bookmarks to GN build.

components/bookmarks/test/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/ui.gni")
+
+source_set("test") {
+  sources = [
+    "bookmark_test_helpers.cc",
+    "bookmark_test_helpers.h",
+    "mock_bookmark_model_observer.cc",
+    "mock_bookmark_model_observer.h",
+    "test_bookmark_client.cc",
+    "test_bookmark_client.h",
+  ]
+
+  deps = [
+    "//base",
+    "//components/bookmarks/browser",
+    "//testing/gmock",
+    "//ui/events/platform",
+    "//url",
+  ]
+
+  if (use_x11) {
+    deps += [
+      "//ui/events/platform/x11",
+    ]
+  }
+}