Add DNS prefetching

Turns out we did no have DNS prefetching. It requires an extra
component. The same component can also do pre-connect, but we do not
enable that, as it requires a predictive browsing backend.

[ChangeLog][Settings] DnsPrefetchEnabled added, but disabled by default.

Change-Id: Ieb036435b9f1a72a7be302e38e89e0c347c7176b
Reviewed-by: Jüri Valdmann <juri.valdmann@qt.io>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/core/web_engine_settings.cpp b/src/core/web_engine_settings.cpp
index 129a3f01d..2e48a806a 100644
--- a/src/core/web_engine_settings.cpp
+++ b/src/core/web_engine_settings.cpp
@@ -298,6 +298,7 @@ void WebEngineSettings::initDefaults()
         s_defaultAttributes.insert(PlaybackRequiresUserGesture, playbackRequiresUserGesture);
         s_defaultAttributes.insert(WebRTCPublicInterfacesOnly, false);
         s_defaultAttributes.insert(JavascriptCanPaste, false);
+        s_defaultAttributes.insert(DnsPrefetchEnabled, false);
     }
 
     if (s_defaultFontFamilies.isEmpty()) {
@@ -390,6 +391,7 @@ void WebEngineSettings::applySettingsToWebPreferences(content::WebPreferences *p
                                : content::AutoplayPolicy::kNoUserGestureRequired;
     }
     prefs->dom_paste_enabled = testAttribute(JavascriptCanPaste);
+    prefs->dns_prefetching_enabled = testAttribute(DnsPrefetchEnabled);
 
     // Fonts settings.
     prefs->standard_font_family_map[content::kCommonScript] = toString16(fontFamily(StandardFont));