Implement WebPrescientNetworking::prefetchDNS.

chrome/renderer/net/prescient_networking_dispatcher.cc

Index: chrome/renderer/net/prescient_networking_dispatcher.cc
diff --git a/chrome/renderer/net/prescient_networking_dispatcher.cc b/chrome/renderer/net/prescient_networking_dispatcher.cc
index e97c167e39d2301a6e52c016912eda82c3b9a9d2..446fe0af73c14ed23300fb3587d8f02a0770d314 100644
--- a/chrome/renderer/net/prescient_networking_dispatcher.cc
+++ b/chrome/renderer/net/prescient_networking_dispatcher.cc
@@ -4,7 +4,9 @@
 
 #include "chrome/renderer/net/prescient_networking_dispatcher.h"
 
+#include "base/strings/utf_string_conversions.h"
 #include "chrome/common/render_messages.h"
+#include "content/public/common/content_client.h"

[Nico, 2013/05/30 00:44:57]

What do you need this for?

[kouhei (in TOK), 2013/05/30 00:54:08]

We don't need this.

Thank you for pointing this out. This was left over from old version of the
patch.

 #include "content/public/renderer/render_thread.h"
 
 using WebKit::WebPrescientNetworking;
@@ -12,6 +14,16 @@ using WebKit::WebPrescientNetworking;
 PrescientNetworkingDispatcher::~PrescientNetworkingDispatcher() {
 }
 
+void PrescientNetworkingDispatcher::prefetchDNS(
+    const WebKit::WebString& hostname) {
+  if (hostname.isEmpty())
+    return;
+
+  std::string hostname_utf8;
+  UTF16ToUTF8(hostname.data(), hostname.length(), &hostname_utf8);
+  net_predictor_.Resolve(hostname_utf8.data(), hostname_utf8.length());
+}
+
 void PrescientNetworkingDispatcher::preconnect(
     const WebKit::WebURL& url,
     WebKit::WebPreconnectMotivation motivation) {