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..ce146ff3c6e0f154b1e2191298fbd41a619be0b2 100644
--- a/third_party/WebKit/Source/web/FullscreenController.cpp
+++ b/third_party/WebKit/Source/web/FullscreenController.cpp
@@ -137,6 +137,13 @@ void FullscreenController::didExitFullScreen()
 
 void FullscreenController::enterFullScreenForElement(Element* element)
 {
+    // TODO(dsinclair): This should not be needed because we addToTopLayer
+    // in Fullscreen::pushFullscreenElementStack but, the WebView code doesn't
+    // call Fullscreen::requestFullscreen() and, instead, just enters and
+    // exists itself. This should be unified so there is one way to go
+    // fullscreen.  crbug.com/538158
+    element->document().addToTopLayer(element);
+
     // We are already transitioning to fullscreen for a different element.
     if (m_provisionalFullScreenElement) {
         m_provisionalFullScreenElement = element;
@@ -162,6 +169,13 @@ void FullscreenController::exitFullScreenForElement(Element* element)
 {
     ASSERT(element);
 
+    // TODO(dsinclair): This should not be needed because we addToTopLayer
+    // in Fullscreen::popFullscreenElementStack but, the WebView code doesn't
+    // call Fullscreen::requestFullscreen() and, instead, just enters and
+    // exists itself. This should be unified so there is one way to go
+    // fullscreen.  crbug.com/538158

[esprehn, 2015/10/09 10:34:00]

good catch

[dsinclair, 2015/10/13 15:50:43]

Acknowledged.

+    element->document().removeFromTopLayer(element);
+
     // The client is exiting full screen, so don't send a notification.
     if (m_isCancelingFullScreen)
         return;
@@ -178,9 +192,10 @@ 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)

[esprehn, 2015/10/09 10:34:00]

if (Element* fullscreenElement =
Fullscreen::currentFullScreenElementFrom(*document))
 ...

[dsinclair, 2015/10/13 15:50:43]

Done.

+        Fullscreen::from(fullscreenElement->document()).didUpdateSize(*fullscreenElement);
 }
 
 void FullscreenController::updatePageScaleConstraints(bool removeConstraints)