Enable smooth transition when show/hide media remoting interstitial.

third_party/WebKit/Source/core/html/shadow/MediaRemotingInterstitial.h

 // 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.
 
 #ifndef MediaRemotingInterstitial_h
 #define MediaRemotingInterstitial_h
 
 #include "core/html/HTMLDivElement.h"
 
 namespace blink {
@@ skipping 16 matching lines @@
 // |    (-internal-media-remoting-cast-text-message)
 // \-MediaRemotingExitButtonElement
 //      (-internal-media-remoting-disable-button)
 class MediaRemotingInterstitial final : public HTMLDivElement {
  public:
   explicit MediaRemotingInterstitial(HTMLVideoElement&);
 
   // Show/Hide Media Remoting interstitial.
   void Show();
   void Hide();
+
   void OnPosterImageChanged();
 
   HTMLVideoElement& GetVideoElement() const { return *video_element_; }
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   // Node override.
   bool IsMediaRemotingInterstitial() const override { return true; }
+  void ToggleInterstitialTimerFired(TimerBase*);

[kinuko, 2017/04/19 06:13:43]

If this one's not overrides please don't interleave.

[xjz, 2017/04/19 17:11:20]

Done.

+  void DidMoveToNewDocument(Document&) override;
 
+  bool is_shown_;

[mlamouri (slow - plz ping), 2017/04/19 16:17:19]

nit: initialise the bool here. Also, add a comment explaining what it actually
means. Because we are transitioning, visibility isn't really a boolean so does
it include "transitions" or not?

Maybe it should be named `is_visible_or_transitioning_`?

[xjz, 2017/04/19 17:11:20]

Done. Added comments. This boolean indicates whether we should show the
interstitial. It could be in transition or after.

+  TaskRunnerTimer<MediaRemotingInterstitial> toggle_insterstitial_timer_;
   Member<HTMLVideoElement> video_element_;
   Member<HTMLImageElement> background_image_;
   Member<MediaRemotingExitButtonElement> exit_button_;
   Member<MediaRemotingCastIconElement> cast_icon_;
   Member<MediaRemotingCastMessageElement> cast_text_message_;
 };
 
 }  // namespace
 
 #endif  // MediaRemotingInterstitial_h