Reland "Sync requestFullscreen() and exitFullscreen() algorithms with the spec"

third_party/WebKit/Source/modules/media_controls/MediaControlsRotateToFullscreenDelegate.cpp

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/media_controls/MediaControlsRotateToFullscreenDelegate.h"
 
 #include "core/dom/ElementVisibilityObserver.h"
 #include "core/dom/Fullscreen.h"
 #include "core/dom/UserGestureIndicator.h"
 #include "core/events/Event.h"
@@ skipping 122 matching lines @@
   current_screen_orientation_ = ComputeScreenOrientation();
   DVLOG(3) << __func__ << " " << static_cast<int>(previous_screen_orientation)
            << " -> " << static_cast<int>(current_screen_orientation_);
 
   // Only enable if native media controls are used.
   if (!video_element_->ShouldShowControls())
     return;
 
   // Don't enter/exit fullscreen if some other element is fullscreen.
   Element* fullscreen_element =
-      Fullscreen::CurrentFullScreenElementFrom(video_element_->GetDocument());
+      Fullscreen::FullscreenElementFrom(video_element_->GetDocument());
   if (fullscreen_element && fullscreen_element != video_element_)
     return;
 
   // To enter fullscreen, video must be visible and playing.
   // TODO(johnme): If orientation changes whilst this tab is in the background,
   // we'll get an orientationchange event when this tab next becomes active.
   // Check that those events don't trigger rotate-to-fullscreen.
   if (!video_element_->IsFullscreen() &&
       (!is_visible_ || video_element_->paused())) {
     return;
@@ skipping 69 matching lines @@
   return SimpleOrientation::kUnknown;
 }
 
 DEFINE_TRACE(MediaControlsRotateToFullscreenDelegate) {
   EventListener::Trace(visitor);
   visitor->Trace(video_element_);
   visitor->Trace(visibility_observer_);
 }
 
 }  // namespace blink