Standalone GN build.

BUILD.gn

 # Copyright 2016 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_overrides/v8.gni")
 import("//testing/test.gni")
 import("pdfium.gni")
 
 config("pdfium_config") {
   cflags = []
@@ skipping 1677 matching lines @@
     "testing/embedder_test_mock_delegate.h",
     "testing/embedder_test_timer_handling_delegate.h",
     "xfa/fxfa/parser/xfa_parser_imp_embeddertest.cpp",
   ]
   deps = [
     ":pdfium",
     ":test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
-  include_dirs = []
+  include_dirs = [ "testing/gmock/include" ]
   if (pdf_enable_v8) {
     sources += [
       "fpdfsdk/javascript/public_methods_embeddertest.cpp",
       "fpdfsdk/jsapi/fxjs_v8_embeddertest.cpp",
       "testing/js_embedder_test.cpp",
       "testing/js_embedder_test.h",
     ]
     deps += [
       "//v8",
       "//v8:v8_libplatform",
     ]
     include_dirs += [
       "//v8",
       "//v8/include",
     ]
     configs += [ "//v8:external_startup_data" ]
   }
   configs += [ ":pdfium_config" ]
 }
+
+if (pdf_is_standalone) {
+  source_set("samples") {
+    testonly = true
+    deps = [
+      "//samples",
+    ]
+  }
+}