New media playback UI.

Source/core/layout/LayoutThemeMac.mm

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Google, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 997 matching lines @@
 {
     return -9;
 }
 
 void LayoutThemeMac::adjustSliderThumbSize(ComputedStyle& style, Element*) const
 {
     float zoomLevel = style.effectiveZoom();
     if (style.appearance() == SliderThumbHorizontalPart || style.appearance() == SliderThumbVerticalPart) {
         style.setWidth(Length(static_cast<int>(sliderThumbWidth * zoomLevel), Fixed));
         style.setHeight(Length(static_cast<int>(sliderThumbHeight * zoomLevel), Fixed));
+    } else {
+        adjustMediaSliderThumbSize(style);

[philipj_slow, 2015/07/08 10:31:52]

Why was this change needed?

[liberato (no reviews please), 2015/07/09 12:10:56]

the original adjust..Size() did nothing unless the slider type was one of the
two media sliders.  the new one does, since it does the same thing in both
cases.

i considered keeping the old behavior there, and not adding the 'else'. 
however, the else seemed less flaky and matches what ThemeDefault does already.

     }
-
-    adjustMediaSliderThumbSize(style);
 }
 
 NSPopUpButtonCell* LayoutThemeMac::popupButton() const
 {
     if (!m_popupButton) {
         m_popupButton.adoptNS([[NSPopUpButtonCell alloc] initTextCell:@"" pullsDown:NO]);
         [m_popupButton.get() setUsesItemFromMenu:NO];
         [m_popupButton.get() setFocusRingType:NSFocusRingTypeExterior];
     }
 
@@ skipping 138 matching lines @@
 
 bool LayoutThemeMac::shouldUseFallbackTheme(const ComputedStyle& style) const
 {
     ControlPart part = style.appearance();
     if (part == CheckboxPart || part == RadioPart)
         return style.effectiveZoom() != 1;
     return false;
 }
 
 } // namespace blink