[Media controls] Add rotate-to-fullscreen gesture behind flag

third_party/WebKit/Source/modules/media_controls/MediaControlsOrientationLockDelegate.h

 // Copyright 2016 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.
 
 #ifndef MediaControlsOrientationLockDelegate_h
 #define MediaControlsOrientationLockDelegate_h
 
 #include "core/events/EventListener.h"
 #include "modules/ModulesExport.h"
 #include "public/platform/modules/screen_orientation/WebScreenOrientationLockType.h"
 
 namespace blink {
 
 class Document;
 class HTMLVideoElement;
 
 // MediaControlsOrientationLockDelegate is implementing the orientation lock
 // feature when a <video> is fullscreen. It is meant to be created by
-// `MediaControls` when the feature applies. Once created, it will use events to
-// change state.
+// `MediaControlsImpl` when the feature applies. Once created, it will use
+// events to change state.
 //
 // The different states of the class are:
 // - PendingFullscreen: the object is created and is waiting for the associated
 //   <video> to go fullscreen in order to apply an orientation lock;
 // - PendingMetadata: the <video> is fullscreen but the metadata have not been
 //   downloaded yet. It can happen because of network latency or because the
 //   <video> went fullscreen before playback and download started;
 // - MaybeLockedFullscreen: the <video> is fullscreen and a screen orientation
 //   lock was applied.
 //
 // The possible state transitions are:
 // - PendingFullscreen => PendingMetadata: on fullscreenchange event (entering
 //   fullscreen) when metadata are not available;
 // - PendingFullscreen => MaybeLockedFullscreen: on fullscreenchange event
 //   (entering fullscreen) when metadata are available;
 // - PendingMetadata => MaybeLockedFullscreen: on loadedmetadata;
 // - PendingMetadata => PendingFullscreen: on fullscreenchange event (leaving
 //   fullscreen);
 // - MaybeLockedFullscreen => PendingFullscreen: on fullscreenchange event
 //   (leaving fullscreen).
 class MediaControlsOrientationLockDelegate final : public EventListener {
  public:
   explicit MediaControlsOrientationLockDelegate(HTMLVideoElement&);
 
-  // Called by MediaControls when the HTMLMediaElement is added to a document
+  // Called by MediaControlsImpl when the HTMLMediaElement is added to a
   // document. All event listeners should be added.
   void Attach();
 
-  // Called by MediaControls when the HTMLMediaElement is no longer in the
+  // Called by MediaControlsImpl when the HTMLMediaElement is no longer in the
   // document. All event listeners should be removed in order to prepare the
   // object to be garbage collected.
   void Detach();
 
   // EventListener implementation.
   bool operator==(const EventListener&) const override;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
@@ skipping 25 matching lines @@
   void MaybeUnlockOrientation();
 
   // Current state of the object. See comment at the top of the file for a
   // detailed description.
   State state_ = State::kPendingFullscreen;
 
   // Whether the controls should unlock the screen orientation when possible.
   // In other words, whether the orientation was locked.
   bool should_unlock_orientation_ = false;
 
-  // `m_videoElement` owns MediaControls that owns |this|.
+  // `video_element_` owns MediaControlsImpl that owns |this|.
   Member<HTMLVideoElement> video_element_;
 };
 
 }  // namespace blink
 
 #endif  // MediaControlsOrientationLockDelegate_h