Use invalidation sets for fullscreen pseudos.

third_party/WebKit/Source/core/dom/StyleEngine.cpp

Index: third_party/WebKit/Source/core/dom/StyleEngine.cpp
diff --git a/third_party/WebKit/Source/core/dom/StyleEngine.cpp b/third_party/WebKit/Source/core/dom/StyleEngine.cpp
index 62bc9c87459e6e449bcdef656b3aefe92adfbe1b..1793093c8983b98efac37ef632db1c41e6f5797c 100644
--- a/third_party/WebKit/Source/core/dom/StyleEngine.cpp
+++ b/third_party/WebKit/Source/core/dom/StyleEngine.cpp
@@ -28,6 +28,7 @@
 #include "core/dom/StyleEngine.h"
 
 #include "core/HTMLNames.h"
+#include "core/css/CSSDefaultStyleSheets.h"
 #include "core/css/CSSFontSelector.h"
 #include "core/css/CSSStyleSheet.h"
 #include "core/css/FontFaceCache.h"
@@ -755,6 +756,15 @@ void StyleEngine::setHttpDefaultStyle(const String& content)
     resolverChanged(FullStyleUpdate);
 }
 
+void StyleEngine::ensureFullscreenUAStyle()
+{
+    CSSDefaultStyleSheets::instance().ensureDefaultStyleSheetForFullscreen();
+    if (!m_resolver)
+        return;
+    if (!m_resolver->hasFullscreenUAStyle())
+        m_resolver->resetRuleFeatures();
+}
+
 DEFINE_TRACE(StyleEngine)
 {
 #if ENABLE(OILPAN)