Move ScrollElasticityController to platform/mac/

Source/platform/mac/ScrollElasticityController.h

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 10 matching lines @@
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef ScrollElasticityController_h
 #define ScrollElasticityController_h
 
 #if USE(RUBBER_BANDING)
 
+#import <CoreFoundation/CoreFoundation.h>
+
+#include "platform/PlatformExport.h"
 #include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/FloatSize.h"
 #include "platform/scroll/ScrollTypes.h"
 #include "wtf/Noncopyable.h"
 
 namespace WebCore {
 
 class PlatformWheelEvent;
 
-class ScrollElasticityControllerClient {
+class PLATFORM_EXPORT ScrollElasticityControllerClient {
 protected:
     virtual ~ScrollElasticityControllerClient() { }
 
 public:
     virtual bool allowsHorizontalStretching() = 0;
     virtual bool allowsVerticalStretching() = 0;
     virtual IntSize stretchAmount() = 0;
     virtual bool pinnedInDirection(const FloatSize&) = 0;
     virtual bool canScrollHorizontally() = 0;
     virtual bool canScrollVertically() = 0;
@@ skipping 43 matching lines @@
     FloatSize m_origVelocity;
 
     bool m_snapRubberbandTimerIsActive;
 };
 
 } // namespace WebCore
 
 #endif // USE(RUBBER_BANDING)
 
 #endif // ScrollElasticityController_h