Add toStdString methods to CString and WTF::String

third_party/WebKit/Source/wtf/text/WTFStringTest.cpp

Index: third_party/WebKit/Source/wtf/text/WTFStringTest.cpp
diff --git a/third_party/WebKit/Source/wtf/text/WTFStringTest.cpp b/third_party/WebKit/Source/wtf/text/WTFStringTest.cpp
index 66cf6370575e91a79756585de2b5ad831776f677..9efa2e4641a9ef101f90d76df11db8b1537e6197 100644
--- a/third_party/WebKit/Source/wtf/text/WTFStringTest.cpp
+++ b/third_party/WebKit/Source/wtf/text/WTFStringTest.cpp
@@ -347,4 +347,23 @@ TEST(StringTest, Lower)
     EXPECT_STREQ("link", String::fromUTF8("LIN\xE2\x84\xAA").lower().utf8().data());
 }
 
+TEST(StringTest, ToStdString)
+{
+    // Empty string case.
+    EXPECT_TRUE(String("").toUTF8().empty());
+    EXPECT_EQ(std::string(), String("").toUTF8());
+
+    // ASCII string case.
+    char kAsciiChars[] = "1";
+    EXPECT_EQ(std::string(kAsciiChars), String(kAsciiChars).toUTF8());
+
+    // UTF-8 string case.
+    char kUTF8Chars[] = "r\xC3\xA9sum\xC3\xA9";
+    EXPECT_EQ(std::string(kUTF8Chars), String::fromUTF8(kUTF8Chars).toUTF8());
+
+    // UTF-16 -> UTF-8 string case.
+    UChar kUTF16Chars[] = {0x20AC, 0xD801, 0};
+    EXPECT_EQ(std::string("\xE2\x82\xAC\xED\xA0\x81"), String(kUTF16Chars).toUTF8());
+}
+
 } // namespace WTF