Convert MediaControlElements timer to UnspecedTimer per-frame TaskRunnerTimer.

third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp

 /*
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 14 matching lines @@
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "core/html/shadow/MediaControlElements.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/InputTypeNames.h"
 #include "core/dom/ClientRect.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/dom/Text.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/events/MouseEvent.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLAnchorElement.h"
 #include "core/html/HTMLLabelElement.h"
 #include "core/html/HTMLMediaSource.h"
 #include "core/html/HTMLSpanElement.h"
 #include "core/html/HTMLVideoElement.h"
@@ skipping 78 matching lines @@
   }
   return false;
 }
 
 }  // anonymous namespace
 
 MediaControlPanelElement::MediaControlPanelElement(MediaControls& mediaControls)
     : MediaControlDivElement(mediaControls, MediaControlsPanel),
       m_isDisplayed(false),
       m_opaque(true),
-      m_transitionTimer(this, &MediaControlPanelElement::transitionTimerFired) {
-}
+      m_transitionTimer(TaskRunnerHelper::get(TaskType::MediaElementEvent,

[mlamouri (slow - plz ping), 2017/01/23 00:00:39]

Ideally, MediaControlElements shouldn't be noticeably different from custom
controls in JS. Is there a generic TaskType that could be used instead of
MediaElementEvent?

+                                              &mediaControls.document()),
+                        this,
+                        &MediaControlPanelElement::transitionTimerFired) {}
 
 MediaControlPanelElement* MediaControlPanelElement::create(
     MediaControls& mediaControls) {
   MediaControlPanelElement* panel = new MediaControlPanelElement(mediaControls);
   panel->setShadowPseudoId(AtomicString("-webkit-media-controls-panel"));
   return panel;
 }
 
 void MediaControlPanelElement::defaultEventHandler(Event* event) {
   // Suppress the media element activation behavior (toggle play/pause) when
@@ skipping 900 matching lines @@
 MediaControlCurrentTimeDisplayElement*
 MediaControlCurrentTimeDisplayElement::create(MediaControls& mediaControls) {
   MediaControlCurrentTimeDisplayElement* element =
       new MediaControlCurrentTimeDisplayElement(mediaControls);
   element->setShadowPseudoId(
       AtomicString("-webkit-media-controls-current-time-display"));
   return element;
 }
 
 }  // namespace blink