[Contextual Search] Add Mojo-enabled API component.

components/contextual_search/BUILD.gn

Index: components/contextual_search/BUILD.gn
diff --git a/components/contextual_search/BUILD.gn b/components/contextual_search/BUILD.gn
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+# Copyright 2015 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("//mojo/public/tools/bindings/mojom.gni")
+
+# GYP version: components/contextual_search.gypi:contextual_search_mojo_bindings
+mojom("mojo_bindings") {
+  sources = [
+    "common/contextual_search_js_api_service.mojom",
+    "common/overlay_page_notifier_service.mojom",
+  ]
+}
+
+# GYP version: components/contextual_search.gypi:contextual_search_browser
+static_library("browser") {
+  sources = [
+    "browser/contextual_search_js_api_service_impl.cc",
+    "browser/contextual_search_js_api_service_impl.h",
+  ]
+  deps = [
+    ":mojo_bindings",
+    "//base",
+  ]
+}
+
+# GYP version: components/contextual_search.gypi:contextual_search_renderer
+static_library("renderer") {
+  sources = [
+    "renderer/contextual_search_wrapper.cc",
+    "renderer/contextual_search_wrapper.h",
+    "renderer/overlay_js_render_frame_observer.cc",
+    "renderer/overlay_js_render_frame_observer.h",
+    "renderer/overlay_page_notifier_service_impl.cc",
+    "renderer/overlay_page_notifier_service_impl.h",
+  ]
+  deps = [
+    ":mojo_bindings",
+    "//base",
+    "//third_party/WebKit/public:blink_headers",
+  ]
+}