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

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 4380a01fb2d69c41051ae38c536576db7c821aac..0b18ba9f89ed892b4dc55fa6450d6e01872bebb3 100644
--- a/third_party/WebKit/Source/web/FullscreenController.cpp
+++ b/third_party/WebKit/Source/web/FullscreenController.cpp
@@ -127,6 +127,10 @@ void FullscreenController::didExitFullscreen() {
   // 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) {