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..33afc82d76202a4ed89e9a22c386969041ac702b 100644
--- a/third_party/WebKit/Source/web/FullscreenController.cpp
+++ b/third_party/WebKit/Source/web/FullscreenController.cpp
@@ -137,6 +137,8 @@ void FullscreenController::didExitFullScreen()
 
 void FullscreenController::enterFullScreenForElement(Element* element)
 {
+    element->document().addToTopLayer(element);

[dsinclair, 2015/09/28 19:22:04]

This fixes up the WebView unit test crash by making sure the element we're
requesting fullscreen for is in the top layer. 

[esprehn, 2015/09/28 20:33:47]

It seems really weird that we need this in two places, why do we need it in both
pushFullscreenElementStack and here?

[philipj_slow, 2015/09/29 08:05:23]

I'm not sure if it's the case here, but there's a mode of operation where the
embedder just goes fullscreen and then notifies us, instead of asking us to
request fullscreen. It sure would be nice if there were just a single code path
for entering fullscreen, but I suspect that would make this CL a lot bigger. A
bug and TODO would be nice, though, if that is the root problem.

[dsinclair, 2015/10/01 14:50:14]

Added comment and filed bug.

+
     // We are already transitioning to fullscreen for a different element.
     if (m_provisionalFullScreenElement) {
         m_provisionalFullScreenElement = element;
@@ -162,6 +164,8 @@ void FullscreenController::exitFullScreenForElement(Element* element)
 {
     ASSERT(element);
 
+    element->document().removeFromTopLayer(element);
+
     // The client is exiting full screen, so don't send a notification.
     if (m_isCancelingFullScreen)
         return;
@@ -178,9 +182,10 @@ 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)
+        Fullscreen::from(fullscreenElement->document()).updatedSize(fullscreenElement);
 }
 
 void FullscreenController::updatePageScaleConstraints(bool removeConstraints)