Web Animations CSS: Support animation of {text,box,-webkit-box}-shadow and fix blur clamping

Source/core/animation/css/CSSAnimatableValueFactory.cpp

Index: Source/core/animation/css/CSSAnimatableValueFactory.cpp
diff --git a/Source/core/animation/css/CSSAnimatableValueFactory.cpp b/Source/core/animation/css/CSSAnimatableValueFactory.cpp
index 4c26bd29a4fc736c733934b7d7fd0ac8ba9e80c6..7740e9205e67eb02f91becb54c0a1996231b8233 100644
--- a/Source/core/animation/css/CSSAnimatableValueFactory.cpp
+++ b/Source/core/animation/css/CSSAnimatableValueFactory.cpp
@@ -44,6 +44,7 @@
 #include "core/animation/AnimatableRepeatable.h"
 #include "core/animation/AnimatableSVGLength.h"
 #include "core/animation/AnimatableSVGPaint.h"
+#include "core/animation/AnimatableShadow.h"
 #include "core/animation/AnimatableShapeValue.h"
 #include "core/animation/AnimatableStrokeDasharrayList.h"
 #include "core/animation/AnimatableTransform.h"
@@ -249,6 +250,8 @@ PassRefPtr<AnimatableValue> CSSAnimatableValueFactory::create(CSSPropertyID prop
         return createFromDouble(style->borderTopWidth());
     case CSSPropertyBottom:
         return createFromLength(style->bottom(), style);
+    case CSSPropertyBoxShadow:
+        return AnimatableShadow::create(style->boxShadow());
     case CSSPropertyClip:
         if (style->hasClip())
             return createFromLengthBox(style->clip(), style);
@@ -345,12 +348,16 @@ PassRefPtr<AnimatableValue> CSSAnimatableValueFactory::create(CSSPropertyID prop
         return createFromColor(property, style);
     case CSSPropertyTextIndent:
         return createFromLength(style->textIndent(), style);
+    case CSSPropertyTextShadow:
+        return AnimatableShadow::create(style->textShadow());
     case CSSPropertyTop:
         return createFromLength(style->top(), style);
     case CSSPropertyWebkitBorderHorizontalSpacing:
         return createFromDouble(style->horizontalBorderSpacing());
     case CSSPropertyWebkitBorderVerticalSpacing:
         return createFromDouble(style->verticalBorderSpacing());
+    case CSSPropertyWebkitBoxShadow:
+        return AnimatableShadow::create(style->boxShadow());
     case CSSPropertyWebkitClipPath:
         return AnimatableClipPathOperation::create(style->clipPath());
     case CSSPropertyWebkitColumnCount: