Enable TCP preconnect and DNS preresolve on cellular.

chrome/browser/net/predictor.cc

Index: chrome/browser/net/predictor.cc
diff --git a/chrome/browser/net/predictor.cc b/chrome/browser/net/predictor.cc
index fea0171d5f284050519fded47c939a0b70537b36..9addc6fc6bf9e2727ac5402ebe19fa9ede77078f 100644
--- a/chrome/browser/net/predictor.cc
+++ b/chrome/browser/net/predictor.cc
@@ -233,8 +233,6 @@ void Predictor::AnticipateOmniboxUrl(const GURL& url, bool preconnectable) {
     return;
   if (!url.is_valid() || !url.has_host())
     return;
-  if (!CanPredictNetworkActionsUI())
-    return;
 
   std::string host = url.HostNoBrackets();
   bool is_new_host_request = (host != last_omnibox_host_);
@@ -243,7 +241,7 @@ void Predictor::AnticipateOmniboxUrl(const GURL& url, bool preconnectable) {
   UrlInfo::ResolutionMotivation motivation(UrlInfo::OMNIBOX_MOTIVATED);
   base::TimeTicks now = base::TimeTicks::Now();
 
-  if (preconnect_enabled_) {
+  if (preconnect_enabled_ && CanPreconnectUI()) {
     if (preconnectable && !is_new_host_request) {
       ++consecutive_omnibox_preconnect_count_;
       // The omnibox suggests a search URL (for which we can preconnect) after
@@ -311,10 +309,10 @@ void Predictor::PreconnectUrlAndSubresources(const GURL& url,
     return;
 
   if (BrowserThread::CurrentlyOn(BrowserThread::UI)) {
-    if (!CanPredictNetworkActionsUI())
+    if (!CanPreconnectUI())
       return;
   } else {
-    if (!CanPredictNetworkActionsIO())
+    if (!CanPreconnectIO())
       return;
   }
 
@@ -956,6 +954,14 @@ bool Predictor::CanPredictNetworkActionsIO() {
   return chrome_browser_net::CanPredictNetworkActionsIO(profile_io_data_);
 }
 
+bool Predictor::CanPreconnectUI() {
+  return chrome_browser_net::CanPreconnectUI(user_prefs_);
+}
+
+bool Predictor::CanPreconnectIO() {
+  return chrome_browser_net::CanPreconnectIO(profile_io_data_);
+}
+
 enum SubresourceValue {
   PRECONNECTION,
   PRERESOLUTION,
@@ -1347,5 +1353,7 @@ void SimplePredictor::ShutdownOnUIThread() {
 
 bool SimplePredictor::CanPredictNetworkActionsUI() { return true; }
 bool SimplePredictor::CanPredictNetworkActionsIO() { return true; }
+bool SimplePredictor::CanPreconnectUI() { return true; }
+bool SimplePredictor::CanPreconnectIO() { return true; }
 
 }  // namespace chrome_browser_net