Hide fullscreen rotation jank

third_party/WebKit/Source/core/frame/FullscreenController.cpp

Index: third_party/WebKit/Source/core/frame/FullscreenController.cpp
diff --git a/third_party/WebKit/Source/core/frame/FullscreenController.cpp b/third_party/WebKit/Source/core/frame/FullscreenController.cpp
index faa33269ffc265d517ad728c2e93afbdefbdb75e..8735f364ac8252d4d10378e0aafa76e9597ea1ef 100644
--- a/third_party/WebKit/Source/core/frame/FullscreenController.cpp
+++ b/third_party/WebKit/Source/core/frame/FullscreenController.cpp
@@ -78,6 +78,7 @@ void FullscreenController::DidEnterFullscreen() {
   web_view_base_->SetVisualViewportOffset(FloatPoint());
 
   state_ = State::kFullscreen;
+  web_view_base_->LayerTreeView()->SetIsFullscreen(true);
 
   // Notify all local frames that we have entered fullscreen.
   for (Frame* frame = web_view_base_->GetPage()->MainFrame(); frame;
@@ -128,6 +129,7 @@ void FullscreenController::DidExitFullscreen() {
   // restore scroll offsets since content may not be overflowing in the same way
   // until they are.
   state_ = State::kNeedsScrollAndScaleRestore;
+  web_view_base_->LayerTreeView()->SetIsFullscreen(false);
 }
 
 void FullscreenController::EnterFullscreen(LocalFrame& frame) {