content: Copy layout test helpers from Blink to Chromium.

content/shell/renderer/test_runner/helper/layout_test_helper_win.cc

+// 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.
+
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <windows.h>
+
+static BOOL font_smoothing_enabled = FALSE;
+
+static void SaveInitialSettings() {
+  ::SystemParametersInfo(SPI_GETFONTSMOOTHING, 0, &font_smoothing_enabled, 0);
+}
+
+// Technically, all we need to do is disable ClearType. However,
+// for some reason, the call to SPI_SETFONTSMOOTHINGTYPE doesn't
+// seem to work, so we just disable font smoothing all together
+// (which works reliably).
+static void InstallLayoutTestSettings() {
+  ::SystemParametersInfo(SPI_SETFONTSMOOTHING, FALSE, 0, 0);
+}
+
+static void RestoreInitialSettings() {
+  ::SystemParametersInfo(
+      SPI_SETFONTSMOOTHING, static_cast<UINT>(font_smoothing_enabled), 0, 0);
+}
+
+static void SimpleSignalHandler(int signalNumber) {
+  // Try to restore the settings and then go down cleanly.
+  RestoreInitialSettings();
+  exit(128 + signalNumber);
+}
+
+int main(int, char**) {
+  // Hooks the ways we might get told to clean up...
+  signal(SIGINT, SimpleSignalHandler);
+  signal(SIGTERM, SimpleSignalHandler);
+
+  SaveInitialSettings();
+
+  InstallLayoutTestSettings();
+
+  // Let the script know we're ready.
+  printf("ready\n");
+  fflush(stdout);
+
+  // Wait for any key (or signal).
+  getchar();
+
+  RestoreInitialSettings();
+
+  return EXIT_SUCCESS;
+}