Adding a new component, Previews.

components/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("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//tools/grit/repack.gni")
 
 if (is_android) {
@@ skipping 91 matching lines @@
     "//components/offline_pages:unit_tests",
     "//components/offline_pages/background:unit_tests",
     "//components/omnibox/browser:unit_tests",
     "//components/open_from_clipboard:unit_tests",
     "//components/os_crypt:unit_tests",
     "//components/password_manager/core/browser:unit_tests",
     "//components/password_manager/core/common:unit_tests",
     "//components/password_manager/sync/browser:unit_tests",
     "//components/precache/core:unit_tests",
     "//components/prefs:unit_tests",
+    "//components/previews:unit_tests",
     "//components/proxy_config:unit_tests",
     "//components/query_parser:unit_tests",
     "//components/rappor:unit_tests",
     "//components/search:unit_tests",
     "//components/search_engines:unit_tests",
     "//components/search_provider_logos:unit_tests",
     "//components/security_state:unit_tests",
     "//components/sessions:unit_tests",
     "//components/signin/core/browser:unit_tests",
     "//components/ssl_config:unit_tests",
@@ skipping 367 matching lines @@
       "//base/test:test_support_perf",
       "//components/scheduler",
       "//components/visitedlink/browser",
       "//content/test:test_support",
       "//testing/gtest",
       "//testing/perf",
       "//url",
     ]
   }
 }