linux: Add tests for FontRenderParams on Linux.

ui/gfx/test/fontconfig_util_linux.h

+// 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.
+
+#ifndef UI_GFX_TEST_FONTCONFIG_UTIL_LINUX_H_
+#define UI_GFX_TEST_FONTCONFIG_UTIL_LINUX_H_
+
+#include <string>
+
+#include "base/files/file_path.h"
+
+namespace gfx {
+
+// NULL-terminated array of paths to font files that are expected to exist on
+// machines where tests are run.
+extern const char* const kSystemFontsForFontconfig[];
+
+// Strings appearing at the beginning and end of Fontconfig XML files.
+extern const char kFontconfigFileHeader[];
+extern const char kFontconfigFileFooter[];
+
+// Strings appearing at the beginning and end of Fontconfig <match> stanzas.
+extern const char kFontconfigMatchHeader[];
+extern const char kFontconfigMatchFooter[];
+
+// Initializes Fontconfig and creates and swaps in a new, empty config.
+void SetUpFontconfig();
+
+// Deinitializes Fontconfig.
+void TearDownFontconfig();
+
+// Loads the font file at |path| into the current config, returning true on
+// success.
+bool LoadFontIntoFontconfig(const base::FilePath& path);
+
+// Instructs Fontconfig to load |path|, an XML configuration file, into the
+// current config, returning true on success.
+bool LoadConfigFileIntoFontconfig(const base::FilePath& path);
+
+// Writes |data| to a file in |temp_dir| and passes it to
+// LoadConfigFileIntoFontconfig().
+bool LoadConfigDataIntoFontconfig(const base::FilePath& temp_dir,
+                                  const std::string& data);
+
+// Returns a Fontconfig <edit> stanza.
+std::string CreateFontconfigEditStanza(const std::string& name,
+                                       const std::string& type,
+                                       const std::string& value);
+
+// Returns a Fontconfig <test> stanza.
+std::string CreateFontconfigTestStanza(const std::string& name,
+                                       const std::string& op,
+                                       const std::string& type,
+                                       const std::string& value);
+
+}  // namespace gfx
+
+#endif  // UI_GFX_TEST_FONTCONFIG_UTIL_LINUX_H_