Implement SmartText selection.

content/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/features.gni")
 import("//build/config/ui.gni")
 import("//gpu/vulkan/features.gni")
 import("//media/media_options.gni")
 import("//ppapi/features/features.gni")
 import("//printing/features/features.gni")
@@ skipping 1753 matching lines @@
       "accessibility/browser_accessibility_manager_android.h",
       "android/composited_touch_handle_drawable.cc",
       "android/composited_touch_handle_drawable.h",
       "android/content_view_core_impl.cc",
       "android/content_view_core_impl.h",
       "android/content_view_core_impl_observer.h",
       "android/content_view_render_view.cc",
       "android/content_view_render_view.h",
       "android/content_view_statics.cc",
       "android/content_view_statics.h",
+      "android/context_selection_client.cc",
+      "android/context_selection_client.h",
       "android/date_time_chooser_android.cc",
       "android/date_time_chooser_android.h",
       "android/gesture_event_type.h",
       "android/interstitial_page_delegate_android.cc",
       "android/interstitial_page_delegate_android.h",
       "android/java/gin_java_bound_object.cc",
       "android/java/gin_java_bound_object.h",
       "android/java/gin_java_bound_object_delegate.cc",
       "android/java/gin_java_bound_object_delegate.h",
       "android/java/gin_java_bridge_dispatcher_host.cc",
@@ skipping 264 matching lines @@
   if (!is_component_build) {
     public_deps = [
       ":browser",
     ]
   } else {
     public_deps = [
       "//third_party/leveldatabase",
     ]
   }
 }