Port ui_base_jni_headers target to GN build.

ui/base/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")
 
 if (is_android) {
   import("//build/config/android/config.gni")
+  import("//build/config/android/rules.gni")
 }
 
 component("ui_base") {
   sources = [
     "accelerators/accelerator.cc",
     "accelerators/accelerator.h",
     "accelerators/accelerator_manager.cc",
     "accelerators/accelerator_manager.h",
     "accelerators/menu_label_accelerator_util_linux.cc",
     "accelerators/menu_label_accelerator_util_linux.h",
@@ skipping 445 matching lines @@
       "l10n/l10n_font_util.cc",
       "models/button_menu_item_model.cc",
       "models/dialog_model.cc",
       "theme_provider.cc",
       "touch/touch_device.cc",
       "touch/touch_editing_controller.cc",
       "ui_base_types.cc",
     ]
 
     deps += [
-      #":ui_base_jni_headers",
+      ":ui_base_jni_headers",
     ]
 
     libs = [
       "jnigraphics",
     ]
   }
 
   if (is_android && is_android_webview_build) {
     deps += [
       #TODO(GYP): port this component to GN.
@@ skipping 48 matching lines @@
 
   if (!is_ios) {
     sources += [
       "ime/dummy_input_method.cc",
       "ime/dummy_input_method.h",
       "ime/dummy_text_input_client.cc",
       "ime/dummy_text_input_client.h",
     ]
   }
 }
+
+if (is_android) {
+  generate_jni("ui_base_jni_headers") {
+    sources = [
+      "../android/java/src/org/chromium/ui/base/Clipboard.java",
+      "../android/java/src/org/chromium/ui/base/DeviceFormFactor.java",
+      "../android/java/src/org/chromium/ui/base/LocalizationUtils.java",
+      "../android/java/src/org/chromium/ui/base/SelectFileDialog.java",
+      "../android/java/src/org/chromium/ui/base/TouchDevice.java",
+      "../android/java/src/org/chromium/ui/base/ViewAndroid.java",
+      "../android/java/src/org/chromium/ui/base/WindowAndroid.java",
+    ]
+    jni_package = "base"
+  }
+}