Hide fullscreen rotation jank

third_party/WebKit/Source/core/frame/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 112 matching lines @@
     if (Document* document = ToLocalFrame(frame)->GetDocument()) {
       if (Fullscreen* fullscreen = Fullscreen::FromIfExists(*document))
         fullscreen->DidExitFullscreen();
     }
 
     // Skip over all descendant frames.
     while (next_frame && next_frame->Tree().IsDescendantOf(frame))
       next_frame = next_frame->Tree().TraverseNext();
     frame = next_frame;
   }
+  web_view_base_->LayerTreeView()->SetIsFullscreen(false);
 }
 
 void FullscreenController::EnterFullscreen(LocalFrame& frame) {
   // If already fullscreen or exiting fullscreen, synchronously call
   // |DidEnterFullscreen()|. When exiting, the coming |DidExitFullscreen()| call
   // will again notify all frames.
   if (state_ == State::kFullscreen || state_ == State::kExitingFullscreen) {
     State old_state = state_;
     state_ = State::kEnteringFullscreen;
     DidEnterFullscreen();
@@ skipping 103 matching lines @@
     if (!frame->IsLocalFrame())
       continue;
     if (Document* document = ToLocalFrame(frame)->GetDocument()) {
       if (Fullscreen* fullscreen = Fullscreen::FromIfExists(*document)) {
         if (LayoutFullScreen* layout_object =
                 fullscreen->FullScreenLayoutObject())
           layout_object->UpdateStyle();
       }
     }
   }
+  if (state_ == State::kFullscreen)
+    web_view_base_->LayerTreeView()->SetIsFullscreen(true);
 }
 
 void FullscreenController::DidUpdateLayout() {
   if (state_ != State::kNeedsScrollAndScaleRestore)
     return;
 
   web_view_base_->SetPageScaleFactor(initial_page_scale_factor_);
   if (web_view_base_->MainFrame()->IsWebLocalFrame()) {
     web_view_base_->MainFrame()->ToWebLocalFrame()->SetScrollOffset(
         WebSize(initial_scroll_offset_));
@@ skipping 23 matching lines @@
   // again to ensure the final constraints pick up the latest contents size.
   web_view_base_->DidChangeContentsSize();
   if (web_view_base_->MainFrameImpl() &&
       web_view_base_->MainFrameImpl()->GetFrameView())
     web_view_base_->MainFrameImpl()->GetFrameView()->SetNeedsLayout();
 
   web_view_base_->UpdateMainFrameLayoutSize();
 }
 
 }  // namespace blink