[fullscreen] (not landed) Force a layout on exiting fullscreen.

third_party/WebKit/Source/web/FullscreenController.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 109 matching lines @@
     if (Document* document = toLocalFrame(frame)->document()) {
       if (Fullscreen* fullscreen = Fullscreen::fromIfExists(*document))
         fullscreen->didExitFullscreen();
     }
   }
 
   // We need to wait until style and layout are updated in order to properly
   // restore scroll offsets since content may not be overflowing in the same way
   // until they are.
   m_state = State::NeedsScrollAndScaleRestore;
+
+  // https://crbug.com/698315: Force a layout to avoid race with resize event
+  // caused by ViewMsg_Resize, which is sent when browser exits fullscreen mode.
+  m_webViewImpl->updateAllLifecyclePhases();
 }
 
 void FullscreenController::enterFullscreen(LocalFrame& frame) {
   // If already fullscreen or exiting fullscreen, synchronously call
   // |didEnterFullscreen()|. When exiting, the coming |didExitFullscren()| call
   // will again notify all frames.
   if (m_state == State::Fullscreen || m_state == State::ExitingFullscreen) {
     State oldState = m_state;
     m_state = State::EnteringFullscreen;
     didEnterFullscreen();
@@ skipping 127 matching lines @@
   // again to ensure the final constraints pick up the latest contents size.
   m_webViewImpl->didChangeContentsSize();
   if (m_webViewImpl->mainFrameImpl() &&
       m_webViewImpl->mainFrameImpl()->frameView())
     m_webViewImpl->mainFrameImpl()->frameView()->setNeedsLayout();
 
   m_webViewImpl->updateMainFrameLayoutSize();
 }
 
 }  // namespace blink