When a font family pref changes to the empty string, pass it to WebKit.

chrome/common/pref_names_util_unittest.cc

+// Copyright (c) 2012 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 "chrome/common/pref_names_util.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+void ExpectNoParse(const std::string& path) {
+  EXPECT_FALSE(pref_names_util::ParseFontNamePrefPath(path, NULL, NULL));
+}
+
+void ExpectParse(const std::string& path,
+                 const std::string& expected_generic_family,
+                 const std::string& expected_script)
+{
+  std::string generic_family;
+  std::string script;
+
+  ASSERT_TRUE(pref_names_util::ParseFontNamePrefPath(path, &generic_family,
+                                                     &script));
+  EXPECT_EQ(expected_generic_family, generic_family);
+  EXPECT_EQ(expected_script, script);
+}
+
+}  // namespace
+
+TEST(PrefNamesUtilTest, Basic) {
+  ExpectNoParse("");
+  ExpectNoParse(".");
+  ExpectNoParse(".....");
+  ExpectNoParse("webkit.webprefs.fonts.");
+  ExpectNoParse("webkit.webprefs.fonts..");
+  ExpectNoParse("webkit.webprefs.fontsfoobar.standard.Hrkt");
+  ExpectNoParse("foobar.webprefs.fonts.standard.Hrkt");
+  ExpectParse("webkit.webprefs.fonts.standard.Hrkt", "standard", "Hrkt");
+  ExpectParse("webkit.webprefs.fonts.standard.Hrkt.", "standard", "Hrkt.");
+  ExpectParse("webkit.webprefs.fonts.standard.Hrkt.Foobar", "standard",
+              "Hrkt.Foobar");
+
+  // We don't particularly care about the parsed family and script for these
+  // inputs, but just want to make sure it does something reasonable. Returning
+  // false may also be an option.
+  ExpectParse("webkit.webprefs.fonts...", "", ".");
+  ExpectParse("webkit.webprefs.fonts....", "", "..");
+
+  // Check that passing NULL output params is okay.
+  EXPECT_TRUE(pref_names_util::ParseFontNamePrefPath(
+      "webkit.webprefs.fonts.standard.Hrkt", NULL, NULL));
+}