Make font-size-adjust animatable.

Source/core/animation/StringKeyframe.cpp

Index: Source/core/animation/StringKeyframe.cpp
diff --git a/Source/core/animation/StringKeyframe.cpp b/Source/core/animation/StringKeyframe.cpp
index 3aa81904ea03a9d174a6b4a3d17f8f4bfb0783b1..3e552e87baaed80b6f29c4fdc6c1d474af46a40b 100644
--- a/Source/core/animation/StringKeyframe.cpp
+++ b/Source/core/animation/StringKeyframe.cpp
@@ -111,6 +111,8 @@ InterpolationRange setRange(CSSPropertyID id)
         return RangeOpacityFIXME;
     case CSSPropertyStrokeMiterlimit:
         return RangeGreaterThanOrEqualToOne;
+    case CSSPropertyFontSizeAdjust:
+        return RangeNonNegative;
     default:
         ASSERT_NOT_REACHED();
         return RangeAll;
@@ -214,6 +216,13 @@ PassRefPtrWillBeRawPtr<Interpolation> StringKeyframe::PropertySpecificKeyframe::
             fallBackToLegacy = true;
 
         break;
+    case CSSPropertyFontSizeAdjust:
+        if (AnimatableValue::usesDefaultInterpolation(

[dstockwell, 2015/03/17 23:36:46]

Hmm, instead of adding these checks here, we can just fall back to the legacy
path for the time being:

case CSSPropertyFontSizeAdjust:
    // FIXME: Requires special handing for 0.
    fallBackToLegacy = true;
    break;

[changseok, 2015/03/18 09:05:02]

Done.

+            StyleResolver::createAnimatableValueSnapshot(*element, baseStyle, property, fromCSSValue).get(),
+            StyleResolver::createAnimatableValueSnapshot(*element, baseStyle, property, toCSSValue).get())) {
+            forceDefaultInterpolation = true;
+            break;
+        }
     case CSSPropertyOrphans:
     case CSSPropertyWidows:
     case CSSPropertyZIndex: