[headless] Enable headless embedders to specify fonts.

headless/public/util/fontconfig.h

Index: headless/public/util/fontconfig.h
diff --git a/headless/public/util/fontconfig.h b/headless/public/util/fontconfig.h
new file mode 100644
index 0000000000000000000000000000000000000000..2a504930613396c70ab324517f91b18e69d2cd98
--- /dev/null
+++ b/headless/public/util/fontconfig.h
@@ -0,0 +1,20 @@
+// Copyright 2017 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.
+
+#ifndef HEADLESS_PUBLIC_UTIL_FONTCONFIG_H_
+#define HEADLESS_PUBLIC_UTIL_FONTCONFIG_H_
+
+namespace headless {
+
+// Initialize fontconfig by loading fonts from given path without following
+// symlinks. This is a wrapper around FcInit from libfreetype bundled with
+// Chromium modified to enable headless embedders to deploy in custom
+// environments.
+void InitFonts(const char* font_config_path);
+
+void ReleaseFonts();
+
+}  // namespace headless
+
+#endif  // HEADLESS_PUBLIC_UTIL_FONTCONFIG_H_