Add test support for setting selected text option for <select> multiple

content/test/test_webkit_platform_support.cc

Index: content/test/test_webkit_platform_support.cc
diff --git a/content/test/test_webkit_platform_support.cc b/content/test/test_webkit_platform_support.cc
index 49992c91e848c47477efca7c94abe8b16643b1ad..804c2d34b83e694c97641144e43f505849a0b10f 100644
--- a/content/test/test_webkit_platform_support.cc
+++ b/content/test/test_webkit_platform_support.cc
@@ -200,6 +200,8 @@ blink::WebString TestWebKitPlatformSupport::queryLocalizedString(
     return base::ASCIIToUTF16("range underflow");
   if (name == blink::WebLocalizedString::ValidationRangeOverflow)
     return base::ASCIIToUTF16("range overflow");
+  if (name == blink::WebLocalizedString::SelectMenuListText)
+    return base::ASCIIToUTF16("$1 selected");
   return BlinkPlatformImpl::queryLocalizedString(name, value);
 }