Use v8's utf8 <-> wide conversion for Linux sys_string_conversion.

base/sys_string_conversions_unittest.cc

Index: base/sys_string_conversions_unittest.cc
diff --git a/base/sys_string_conversions_unittest.cc b/base/sys_string_conversions_unittest.cc
index 56c5412ec5d8850c862a730596d0862806d76f4c..f518b3db6942b7178df5fe1a0a75a0f68d0f5b61 100644
--- a/base/sys_string_conversions_unittest.cc
+++ b/base/sys_string_conversions_unittest.cc
@@ -177,6 +177,25 @@ static const wchar_t* const kConvertRoundtripCases[] = {
 #endif
 };
 
+TEST(SysStrings, SysWideAndUtf8) {
+  // Should not depend on the locale.
+  for (size_t i = 0; i < arraysize(kConvertRoundtripCases); ++i) {
+    std::wstring wide = kConvertRoundtripCases[i];
+    std::wstring trip = base::SysUTF8ToWide(base::SysWideToUTF8(wide));
+    EXPECT_EQ(wide.size(), trip.size());
+    EXPECT_EQ(wide, trip);
+  }
+}
+
+TEST(SysStrings, SysInvalidUtf8) {
+  EXPECT_EQ(1U, base::SysUTF8ToWide("\xc2\x80").size());  // Valid.
+  EXPECT_EQ(0U, base::SysUTF8ToWide("\x80").size());
+  EXPECT_EQ(3U, base::SysUTF8ToWide("abc").size());  // Valid.
+  EXPECT_EQ(0U, base::SysUTF8ToWide("abc\x80").size());
+  EXPECT_EQ(0U, base::SysUTF8ToWide("\xc0""aaaaaaaaa").size());
+  EXPECT_EQ(0U, base::SysUTF8ToWide("\xf5""aaaaaaaaa").size());
+  EXPECT_EQ(0U, base::SysUTF8ToWide("\xfe""aaaaaaaaa").size());
+}
 
 TEST(SysStrings, SysNativeMBAndWide) {
   ScopedSetLocale locale("en_US.utf-8");