Reland "Add plumbing for font-stretch"

Source/core/animation/css/CSSPropertyEquality.cpp

 // Copyright 2014 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.
 
 #include "config.h"
 #include "core/animation/css/CSSPropertyEquality.h"
 
 #include "core/animation/css/CSSAnimations.h"
 #include "core/rendering/style/DataEquivalency.h"
 #include "core/rendering/style/RenderStyle.h"
@@ skipping 124 matching lines @@
     case CSSPropertyFloodColor:
         return a.floodColor() == b.floodColor();
     case CSSPropertyFloodOpacity:
         return a.floodOpacity() == b.floodOpacity();
     case CSSPropertyFontSize:
         // CSSPropertyFontSize: Must pass a specified size to setFontSize if Text Autosizing is enabled, but a computed size
         // if text zoom is enabled (if neither is enabled it's irrelevant as they're probably the same).
         // FIXME: Should we introduce an option to pass the computed font size here, allowing consumers to
         // enable text zoom rather than Text Autosizing? See http://crbug.com/227545.
         return a.specifiedFontSize() == b.specifiedFontSize();
+    case CSSPropertyFontStretch:
+        return a.fontStretch() == b.fontStretch();
     case CSSPropertyFontWeight:
         return a.fontWeight() == b.fontWeight();
     case CSSPropertyHeight:
         return a.height() == b.height();
     case CSSPropertyLeft:
         return a.left() == b.left();
     case CSSPropertyLetterSpacing:
         return a.letterSpacing() == b.letterSpacing();
     case CSSPropertyLightingColor:
         return a.lightingColor() == b.lightingColor();
@@ skipping 142 matching lines @@
         return a.zIndex() == b.zIndex();
     case CSSPropertyZoom:
         return a.zoom() == b.zoom();
     default:
         ASSERT_NOT_REACHED();
         return true;
     }
 }
 
 }