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>

2 files changed, 14 insertions, 0 deletions

diff --git a/src/core/renderer/content_renderer_client_qt.cpp b/src/core/renderer/content_renderer_client_qt.cpp
index 707efc1c1..79c2294de 100644
--- a/src/core/renderer/content_renderer_client_qt.cpp
+++ b/src/core/renderer/content_renderer_client_qt.cpp
@@ -51,6 +51,7 @@
 #include "components/error_page/common/error.h"
 #include "components/error_page/common/error_page_params.h"
 #include "components/error_page/common/localized_error.h"
+#include "components/network_hints/renderer/prescient_networking_dispatcher.h"
 #if QT_CONFIG(webengine_printing_and_pdf)
 #include "components/printing/renderer/print_render_frame_helper.h"
 #endif
@@ -114,6 +115,8 @@ void ContentRendererClientQt::RenderThreadStarted()
     m_visitedLinkSlave.reset(new visitedlink::VisitedLinkSlave);
     m_webCacheImpl.reset(new web_cache::WebCacheImpl());
 
+    m_prescientNetworkingDispatcher.reset(new network_hints::PrescientNetworkingDispatcher());
+
     auto registry = std::make_unique<service_manager::BinderRegistry>();
     registry->AddInterface(m_visitedLinkSlave->GetBindCallback(),
                            base::ThreadTaskRunnerHandle::Get());
@@ -239,6 +242,11 @@ bool ContentRendererClientQt::IsLinkVisited(unsigned long long linkHash)
     return m_visitedLinkSlave->IsVisited(linkHash);
 }
 
+blink::WebPrescientNetworking *ContentRendererClientQt::GetPrescientNetworking()
+{
+    return m_prescientNetworkingDispatcher.get();
+}
+
 void ContentRendererClientQt::OnStart()
 {
     context()->connector()->BindConnectorRequest(std::move(m_connectorRequest));
diff --git a/src/core/renderer/content_renderer_client_qt.h b/src/core/renderer/content_renderer_client_qt.h
index a919c6ab6..2a353caa6 100644
--- a/src/core/renderer/content_renderer_client_qt.h
+++ b/src/core/renderer/content_renderer_client_qt.h
@@ -53,6 +53,10 @@ namespace error_page {
 class Error;
 }
 
+namespace network_hints {
+class PrescientNetworkingDispatcher;
+}
+
 namespace visitedlink {
 class VisitedLinkSlave;
 }
@@ -89,6 +93,7 @@ public:
 
     unsigned long long VisitedLinkHash(const char *canonicalUrl, size_t length) override;
     bool IsLinkVisited(unsigned long long linkHash) override;
+    blink::WebPrescientNetworking* GetPrescientNetworking() override;
     void AddSupportedKeySystems(std::vector<std::unique_ptr<media::KeySystemProperties>>* key_systems) override;
 
     void RunScriptsAtDocumentEnd(content::RenderFrame* render_frame) override;
@@ -123,6 +128,7 @@ private:
     service_manager::mojom::ConnectorRequest m_connectorRequest;
     std::unique_ptr<service_manager::ServiceContext> m_serviceContext;
     service_manager::BinderRegistry m_registry;
+    std::unique_ptr<network_hints::PrescientNetworkingDispatcher> m_prescientNetworkingDispatcher;
 
     DISALLOW_COPY_AND_ASSIGN(ContentRendererClientQt);
 };