New media playback UI.

Source/core/html/shadow/MediaControlElementTypes.h

 /*
  * 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 58 matching lines @@
 
 CORE_EXPORT HTMLMediaElement* toParentMediaElement(Node*);
 inline HTMLMediaElement* toParentMediaElement(LayoutObject* layoutObject) { return toParentMediaElement(layoutObject->node()); }
 
 CORE_EXPORT MediaControlElementType mediaControlElementType(Node*);
 
 // ----------------------------
 
 class MediaControlElement : public WillBeGarbageCollectedMixin {
 public:
-    void hide();
-    void show();
+    // These hold the state about whether this control should be shown if
+    // space permits.  These will also show / hide as needed.
+    void setIsWanted(bool);
+    bool isWanted();
+
+    // Tell us whether we fit or not.  This will hide / show the control as
+    // needed, also.
+    void setDoesFit(bool);
+
+    // This returns the minimum width in pixels that we need to show
+    // this control.  Ideally, this would just be shorthand for the computed
+    // style, but this must also work when the control is hidden.
+    int minimumWidth();

[liberato (no reviews please), 2015/08/04 15:07:00]

in cases where the bar had between 48 and 54 pixel remaining, having the numeric
time display in place of the slider was just weird.  switched it so they stay
strictly in order.

 
     MediaControlElementType displayType() { return m_displayType; }
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     MediaControlElement(MediaControls&, MediaControlElementType, HTMLElement*);
 
     MediaControls& mediaControls() const { return m_mediaControls; }
     HTMLMediaElement& mediaElement() const;
 
     void setDisplayType(MediaControlElementType);
 
 private:
+    // Hide or show based on our fits / wanted state.  We want to show
+    // if and only if we're wanted and we fit.
+    void updateShownState();
+
     MediaControls& m_mediaControls;
     MediaControlElementType m_displayType;
     RawPtrWillBeMember<HTMLElement> m_element;
+    bool m_isWanted : 1;
+    bool m_doesFit : 1;
 };
 
 // ----------------------------
 
 class MediaControlDivElement : public HTMLDivElement, public MediaControlElement {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MediaControlDivElement);
 public:
     DECLARE_VIRTUAL_TRACE();
 
 protected:
@@ skipping 29 matching lines @@
 protected:
     MediaControlTimeDisplayElement(MediaControls&, MediaControlElementType);
 
 private:
     double m_currentValue;
 };
 
 } // namespace blink
 
 #endif // MediaControlElementTypes_h