[Contextual Search] Add Mojo-enabled API component.

chrome/browser/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/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
 import("//media/media_options.gni")
@@ skipping 300 matching lines @@
       "//chrome/app/theme:theme_resources",
       "//chrome/browser/devtools",
       "//chrome/browser/metrics/variations:chrome_ui_string_overrider_factory",
       "//chrome/browser/resources:component_extension_resources",
       "//chrome/common/net",
       "//chrome/installer/util",
       "//components/about_handler",
       "//components/app_modal",
       "//components/autofill/content/browser",
       "//components/browsing_data",
+      "//components/contextual_search:browser",
       "//components/data_reduction_proxy/content/browser",
       "//components/data_use_measurement/content",
       "//components/devtools_discovery",
       "//components/devtools_http_handler",
       "//components/dom_distiller/content/browser",
       "//components/error_page/common",
       "//components/favicon/content",
       "//components/history/content/browser",
       "//components/keyed_service/content",
       "//components/navigation_interception",
@@ skipping 989 matching lines @@
         rebase_path(gypi_values.chrome_browser_rlz_sources, ".", "//chrome")
     deps = [
       "//components/google/core/browser",
       "//components/omnibox/browser",
       "//components/rlz",
       "//components/search_engines",
       "//rlz:rlz_lib",
     ]
   }
 }