Move TimingFunction.h to platform/

Source/platform/animation/TimingFunction.h

Index: Source/platform/animation/TimingFunction.h
diff --git a/Source/core/platform/animation/TimingFunction.h b/Source/platform/animation/TimingFunction.h
similarity index 96%
rename from Source/core/platform/animation/TimingFunction.h
rename to Source/platform/animation/TimingFunction.h
index 147d86b390b94b7227a3df631d79b8bc23365e37..bfe70d74ff9d9dc19a6324f1136a2e1453afd051 100644
--- a/Source/core/platform/animation/TimingFunction.h
+++ b/Source/platform/animation/TimingFunction.h
@@ -26,6 +26,7 @@
 #define TimingFunction_h
 
 #include "RuntimeEnabledFeatures.h"
+#include "platform/PlatformExport.h"
 #include "platform/animation/AnimationUtilities.h" // For blend()
 #include "platform/animation/UnitBezier.h"
 #include "wtf/OwnPtr.h"
@@ -39,7 +40,7 @@
 
 namespace WebCore {
 
-class TimingFunction : public RefCounted<TimingFunction> {
+class PLATFORM_EXPORT TimingFunction : public RefCounted<TimingFunction> {
 public:
 
     enum Type {
@@ -64,7 +65,7 @@ private:
     Type m_type;
 };
 
-class LinearTimingFunction : public TimingFunction {
+class PLATFORM_EXPORT LinearTimingFunction : public TimingFunction {
 public:
     static PassRefPtr<LinearTimingFunction> create()
     {
@@ -91,7 +92,7 @@ private:
 // Forward declare so we can friend it below. Don't use in production code!
 class ChainedTimingFunctionTestHelper;
 
-class CubicBezierTimingFunction : public TimingFunction {
+class PLATFORM_EXPORT CubicBezierTimingFunction : public TimingFunction {
 public:
     enum SubType {
         Ease,
@@ -172,7 +173,7 @@ private:
     mutable OwnPtr<UnitBezier> m_bezier;
 };
 
-class StepsTimingFunction : public TimingFunction {
+class PLATFORM_EXPORT StepsTimingFunction : public TimingFunction {
 public:
     enum SubType {
         Start,
@@ -233,7 +234,7 @@ private:
     SubType m_subType;
 };
 
-class ChainedTimingFunction : public TimingFunction {
+class PLATFORM_EXPORT ChainedTimingFunction : public TimingFunction {
 public:
     static PassRefPtr<ChainedTimingFunction> create()
     {