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diff --git a/chrome/common/l10n_util_unittest.cc b/chrome/common/l10n_util_unittest.cc
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+++ b/chrome/common/l10n_util_unittest.cc
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "base/file_util.h"
+#include "base/path_service.h"
+#include "base/string_util.h"
+#include "chrome/common/chrome_paths.h"
+#include "chrome/common/l10n_util.h"
+#include "chrome/test/data/resource.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "unicode/locid.h"
+
+namespace {
+
+class L10nUtilTest: public testing::Test {
+};
+
+TEST(L10nUtilTest, GetString) {
+  std::wstring s = l10n_util::GetString(IDS_SIMPLE);
+  EXPECT_EQ(std::wstring(L"Hello World!"), s);
+
+  s = l10n_util::GetStringF(IDS_PLACEHOLDERS, L"chrome", L"10");
+  EXPECT_EQ(std::wstring(L"Hello, chrome. Your number is 10."), s);
+
+  s = l10n_util::GetStringF(IDS_PLACEHOLDERS_2, 20);
+  EXPECT_EQ(std::wstring(L"You owe me $20."), s);
+}
+
+TEST(L10nUtilTest, TruncateString) {
+  std::wstring string(L"foooooey    bxxxar baz");
+
+  // Make sure it doesn't modify the string if length > string length.
+  EXPECT_EQ(string, l10n_util::TruncateString(string, 100));
+
+  // Test no characters.
+  EXPECT_EQ(L"", l10n_util::TruncateString(string, 0));
+
+  // Test 1 character.
+  EXPECT_EQ(L"\x2026", l10n_util::TruncateString(string, 1));
+
+  // Test adds ... at right spot when there is enough room to break at a
+  // word boundary.
+  EXPECT_EQ(L"foooooey\x2026", l10n_util::TruncateString(string, 14));
+
+  // Test adds ... at right spot when there is not enough space in first word.
+  EXPECT_EQ(L"f\x2026", l10n_util::TruncateString(string, 2));
+
+  // Test adds ... at right spot when there is not enough room to break at a
+  // word boundary.
+  EXPECT_EQ(L"foooooey\x2026", l10n_util::TruncateString(string, 11));
+
+  // Test completely truncates string if break is on initial whitespace.
+  EXPECT_EQ(L"\x2026", l10n_util::TruncateString(L"   ", 2));
+}
+
+void SetICUDefaultLocale(const std::wstring& locale_string) {
+  Locale locale(WideToASCII(locale_string).c_str());
+  UErrorCode error_code = U_ZERO_ERROR;
+  Locale::setDefault(locale, error_code);
+  EXPECT_TRUE(U_SUCCESS(error_code));
+}
+
+TEST(L10nUtilTest, GetAppLocale) {
+  // Use a temporary locale dir so we don't have to actually build the locale
+  // dlls for this test.
+  std::wstring orig_locale_dir;
+  PathService::Get(chrome::DIR_LOCALES, &orig_locale_dir);
+  std::wstring new_locale_dir;
+  EXPECT_TRUE(file_util::CreateNewTempDirectory(L"l10n_util_test",
+                                                &new_locale_dir));
+  PathService::Override(chrome::DIR_LOCALES, new_locale_dir);
+  // Make fake locale files.
+  const wchar_t* filenames[] = {
+    L"en-US.dll",
+    L"en-GB.dll",
+    L"fr.dll",
+    L"es-419.dll",
+    L"es.dll",
+  };
+  for (size_t i = 0; i < arraysize(filenames); ++i) {
+    std::wstring filename = new_locale_dir;
+    file_util::AppendToPath(&filename, filenames[i]);
+    file_util::WriteFile(filename, "", 0);
+  }
+
+  // Keep a copy of ICU's default locale before we overwrite it.
+  Locale locale = Locale::getDefault();
+
+  SetICUDefaultLocale(L"en-US");
+  EXPECT_EQ(L"en-US", l10n_util::GetApplicationLocale(L""));
+
+  SetICUDefaultLocale(L"en-GB");
+  EXPECT_EQ(L"en-GB", l10n_util::GetApplicationLocale(L""));
+
+  SetICUDefaultLocale(L"fr-CA");
+  EXPECT_EQ(L"fr", l10n_util::GetApplicationLocale(L""));
+
+  SetICUDefaultLocale(L"xx");
+  EXPECT_EQ(L"en-US", l10n_util::GetApplicationLocale(L""));
+
+  SetICUDefaultLocale(L"en-US");
+  EXPECT_EQ(L"fr", l10n_util::GetApplicationLocale(L"fr"));
+  EXPECT_EQ(L"fr", l10n_util::GetApplicationLocale(L"fr-CA"));
+  // es-419 and es-XX (where XX is not Spain) should be
+  // mapped to es-419 (Latin American Spanish).
+  EXPECT_EQ(L"es-419", l10n_util::GetApplicationLocale(L"es-419"));
+  EXPECT_EQ(L"es", l10n_util::GetApplicationLocale(L"es-ES"));
+  EXPECT_EQ(L"es-419", l10n_util::GetApplicationLocale(L"es-AR"));
+
+  SetICUDefaultLocale(L"es-MX");
+  EXPECT_EQ(L"es-419", l10n_util::GetApplicationLocale(L""));
+
+  SetICUDefaultLocale(L"es-AR");
+  EXPECT_EQ(L"es-419", l10n_util::GetApplicationLocale(L""));
+  EXPECT_EQ(L"es", l10n_util::GetApplicationLocale(L"es"));
+
+  SetICUDefaultLocale(L"es-ES");
+  EXPECT_EQ(L"es", l10n_util::GetApplicationLocale(L""));
+
+  SetICUDefaultLocale(L"es");
+  EXPECT_EQ(L"es", l10n_util::GetApplicationLocale(L""));
+
+  // Clean up.
+  PathService::Override(chrome::DIR_LOCALES, orig_locale_dir);
+  file_util::Delete(new_locale_dir, true);
+  UErrorCode error_code = U_ZERO_ERROR;
+  Locale::setDefault(locale, error_code);
+}
+
+}