Reland "Sync requestFullscreen() and exitFullscreen() algorithms with the spec"

third_party/WebKit/Source/core/exported/WebViewBase.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.#ifndef WebViewBase_h
 
 #ifndef WebViewBase_h
 #define WebViewBase_h
 
 #include "core/page/EventWithHitTestResults.h"
 #include "platform/transforms/TransformationMatrix.h"
 #include "platform/wtf/RefCounted.h"
@@ skipping 127 matching lines @@
   // After calling WebWidget::updateAllLifecyclePhases(), expect to get this
   // notification unless the view did not need a layout.
   virtual void LayoutUpdated(WebLocalFrameBase*) = 0;
   virtual void ResizeAfterLayout(WebLocalFrameBase*) = 0;
 
   virtual void UpdatePageDefinedViewportConstraints(
       const ViewportDescription&) = 0;
 
   virtual void EnterFullscreen(LocalFrame&) = 0;
   virtual void ExitFullscreen(LocalFrame&) = 0;
-  virtual void FullscreenElementChanged(Element*, Element*) = 0;
+  virtual void FullscreenElementChanged(Element* from_element,
+                                        Element* to_element) = 0;
 
   virtual bool HasOpenedPopup() const = 0;
 
   // Returns true if popup menus should be rendered by the browser, false if
   // they should be rendered by WebKit (which is the default).
   static bool UseExternalPopupMenus();
 
   virtual GraphicsLayer* RootGraphicsLayer() = 0;
   virtual void RegisterViewportLayersWithCompositor() = 0;
   virtual PaintLayerCompositor* Compositor() const = 0;
@@ skipping 57 matching lines @@
   virtual void EnableTapHighlightAtPoint(
       const GestureEventWithHitTestResults& targeted_tap_event) = 0;
   virtual LinkHighlightImpl* GetLinkHighlight(int) = 0;
   virtual unsigned NumLinkHighlights() = 0;
   virtual void EnableTapHighlights(HeapVector<Member<Node>>&) = 0;
   virtual void SetCurrentInputEventForTest(const WebInputEvent*) = 0;
 };
 }
 
 #endif