Avoid loosing of the display mode value

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index 13d170d5072608a861d4bf63084e321c5b495733..880e4c52e5d3e0f51d3790672363efc0590df893 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -440,6 +440,7 @@ WebViewImpl::WebViewImpl(WebViewClient* client)
     , m_backgroundColorOverride(Color::transparent)
     , m_zoomFactorOverride(0)
     , m_userGestureObserved(false)
+    , m_displayMode(WebDisplayModeBrowser)
 {
     Page::PageClients pageClients;
     pageClients.chromeClient = &m_chromeClientImpl;
@@ -576,6 +577,7 @@ void WebViewImpl::handleMouseDown(LocalFrame& mainFrame, const WebMouseEvent& ev
 
 void WebViewImpl::setDisplayMode(WebDisplayMode mode)
 {
+    m_displayMode = mode;
     if (!mainFrameImpl() || !mainFrameImpl()->frameView())
         return;