Added detection timeouts and usage of Retry-After HTTP header.

chrome/browser/captive_portal/captive_portal_detector.cc

Index: chrome/browser/captive_portal/captive_portal_detector.cc
diff --git a/chrome/browser/captive_portal/captive_portal_detector.cc b/chrome/browser/captive_portal/captive_portal_detector.cc
index 4c59437cbf662699fc5864d7bfc8ab88cfb4f57f..70dbbc5f536df992b6c2ea270a7b3fc1647fa53a 100644
--- a/chrome/browser/captive_portal/captive_portal_detector.cc
+++ b/chrome/browser/captive_portal/captive_portal_detector.cc
@@ -14,6 +14,19 @@
 
 namespace captive_portal {
 
+namespace {
+
+const char* const kCaptivePortalResultNames[] = {
+  "InternetConnected",
+  "NoResponse",
+  "BehindCaptivePortal",
+  "NumCaptivePortalResults",
+};
+COMPILE_ASSERT(arraysize(kCaptivePortalResultNames) == RESULT_COUNT + 1,
+               captive_portal_result_name_count_mismatch);
+
+}  // namespace
+
 const char CaptivePortalDetector::kDefaultURL[] =
     "http://www.gstatic.com/generate_204";
 
@@ -25,6 +38,14 @@ CaptivePortalDetector::CaptivePortalDetector(
 CaptivePortalDetector::~CaptivePortalDetector() {
 }
 
+// static
+std::string CaptivePortalDetector::CaptivePortalResultToString(Result result) {
+  DCHECK_GE(result, 0);
+  DCHECK_LT(static_cast<unsigned int>(result),
+            arraysize(kCaptivePortalResultNames));
+  return kCaptivePortalResultNames[result];
+}
+
 void CaptivePortalDetector::DetectCaptivePortal(
     const GURL& url,
     const DetectionCallback& detection_callback) {