Implement FullScreen using top layer.

third_party/WebKit/Source/web/FullscreenController.cpp

Index: third_party/WebKit/Source/web/FullscreenController.cpp
diff --git a/third_party/WebKit/Source/web/FullscreenController.cpp b/third_party/WebKit/Source/web/FullscreenController.cpp
index 019c1d2e18be77f7baabaf7b55f91b3117a9926d..3a18d5021b795e1e110c1bf2bc768ad6f3d27a72 100644
--- a/third_party/WebKit/Source/web/FullscreenController.cpp
+++ b/third_party/WebKit/Source/web/FullscreenController.cpp
@@ -178,9 +178,10 @@ void FullscreenController::updateSize()
 
     updatePageScaleConstraints(false);
 
-    LayoutFullScreen* layoutObject = Fullscreen::from(*m_fullScreenFrame->document()).fullScreenLayoutObject();
-    if (layoutObject)
-        layoutObject->updateStyle();
+    Document* document = m_fullScreenFrame->document();
+    Element* fullscreenElement = Fullscreen::currentFullScreenElementFrom(*document);
+    if (fullscreenElement)
+        document->setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::FullScreen));

[esprehn, 2015/09/24 20:17:02]

This recalc's the style of the entire full screen subtree every time we call
updateStyle(), that seems bad. All you're trying to do is run that StyleAdjuster
code again? Is LocalStyleChange not enough?

Also lets do this with an API inside Fullscreen, not in web/

[dsinclair, 2015/09/28 17:14:58]

Done.

 }
 
 void FullscreenController::updatePageScaleConstraints(bool removeConstraints)