Add Cookie.CookieLineCookieValueValidity histogram

net/cookies/parsed_cookie.cc

Index: net/cookies/parsed_cookie.cc
diff --git a/net/cookies/parsed_cookie.cc b/net/cookies/parsed_cookie.cc
index 0be70e1565fec6579c369ef13c5dc3d0dd83b4f5..9a2e7d7c342cbcc4a2c0ae61c063b166a7e4f973 100644
--- a/net/cookies/parsed_cookie.cc
+++ b/net/cookies/parsed_cookie.cc
@@ -45,6 +45,7 @@
 #include "net/cookies/parsed_cookie.h"
 
 #include "base/logging.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/strings/string_util.h"
 
 namespace {
@@ -425,6 +426,11 @@ void ParsedCookie::ParseTokenValuePairs(const std::string& cookie_line) {
       break;
     }
 
+    if (pair_num == 0) {
+      UMA_HISTOGRAM_BOOLEAN("Cookie.CookieLineCookieValueValidity",
+                            IsValidCookieValue(pair.second));
+    }
+
     pairs_.push_back(pair);
 
     // We've processed a token/value pair, we're either at the end of