Make font-size-adjust animatable.

Source/core/css/resolver/FontBuilder.cpp

Index: Source/core/css/resolver/FontBuilder.cpp
diff --git a/Source/core/css/resolver/FontBuilder.cpp b/Source/core/css/resolver/FontBuilder.cpp
index f4ac93595588604e94b3f5118cb37d9e43b2199b..28cebbcf4a2ddf7ff454393fd5d60a4840e8ef1d 100644
--- a/Source/core/css/resolver/FontBuilder.cpp
+++ b/Source/core/css/resolver/FontBuilder.cpp
@@ -335,6 +335,10 @@ void FontBuilder::updateAdjustedSize(FontDescription& fontDescription, const Lay
         return;
 
     // We need to create a temporal Font to get xHeight of a primary font.
+    // The aspect value is based on the xHeight of the font for the computed font size,
+    // so we need to reset the adjustment.
+    fontDescription.setAdjustedSize(0);
+
     Font font(fontDescription);
     font.update(fontSelector);
     if (!font.fontMetrics().hasXHeight())