Add test infrastructure for the file-picker modal test

chrome/test/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/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/chrome_tests.gni")
@@ skipping 379 matching lines @@
         sources -= [ "../browser/ui/views/toolbar/toolbar_button_test.cc" ]
 
         if (!is_chromeos) {
           # Desktop linux.
           sources -= [
             # TODO(port): This times out. Attempts have been made to fix the
             # individual failures, but each time I disable a test from these
             # suites, it seems like one or another starts timing out too.
             "../browser/ui/views/keyboard_access_browsertest.cc",
           ]
+          sources +=
+              [ "../browser/ui/libgtk2ui/select_file_dialog_interactive_uitest.cc" ]
+          configs += [ "//build/config/linux/gtk2:gtk2_internal_config" ]
         }
       }
       if (is_chromeos || !use_x11) {
         sources -= [
           "../../ui/views/widget/desktop_aura/desktop_window_tree_host_x11_interactive_uitest.cc",
           "../../ui/views/widget/desktop_aura/x11_topmost_window_finder_interactive_uitest.cc",
         ]
       }
       if (use_aura) {
         deps += [ "//ui/touch_selection" ]
@@ skipping 1829 matching lines @@
 if (is_android) {
   android_library("unit_tests_java") {
     DEPRECATED_java_in_dir = "//chrome/test/android/unit_tests_apk/src"
     deps = [
       "//base:base_java",
       "//chrome/android:chrome_java",
       "//content/public/android:content_java",
     ]
   }
 }