Hide fullscreen rotation jank

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 60 matching lines @@
   if (state_ != State::kEnteringFullscreen)
     return;
 
   UpdatePageScaleConstraints(false);
   web_view_base_->SetPageScaleFactor(1.0f);
   if (web_view_base_->MainFrame()->IsWebLocalFrame())
     web_view_base_->MainFrame()->SetScrollOffset(WebSize());
   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;
        frame = frame->Tree().TraverseNext()) {
     if (!frame->IsLocalFrame())
       continue;
     if (Document* document = ToLocalFrame(frame)->GetDocument()) {
       if (Fullscreen* fullscreen = Fullscreen::FromIfExists(*document))
         fullscreen->DidEnterFullscreen();
     }
@@ skipping 30 matching lines @@
     if (Document* document = ToLocalFrame(frame)->GetDocument()) {
       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.
   state_ = State::kNeedsScrollAndScaleRestore;
+  web_view_base_->LayerTreeView()->SetIsFullscreen(false);
 }
 
 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 (state_ == State::kFullscreen || state_ == State::kExitingFullscreen) {
     State old_state = state_;
     state_ = State::kEnteringFullscreen;
     DidEnterFullscreen();
@@ skipping 145 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