Implement CSSOM Smooth Scroll API

Source/platform/scroll/ProgrammaticScrollAnimator.h

Index: Source/platform/scroll/ProgrammaticScrollAnimator.h
diff --git a/Source/core/xml/parser/SharedBufferReader.h b/Source/platform/scroll/ProgrammaticScrollAnimator.h
similarity index 61%
copy from Source/core/xml/parser/SharedBufferReader.h
copy to Source/platform/scroll/ProgrammaticScrollAnimator.h
index 7217de95fcf74bdadcf451da55088bc4eeda8fb7..f90f0ce7d8723246202b62d2304692926cb6d018 100644
--- a/Source/core/xml/parser/SharedBufferReader.h
+++ b/Source/platform/scroll/ProgrammaticScrollAnimator.h
@@ -28,33 +28,52 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef SharedBufferReader_h
-#define SharedBufferReader_h
+#ifndef ProgrammaticScrollAnimator_h
+#define ProgrammaticScrollAnimator_h
 
+#include "platform/geometry/FloatPoint.h"
 #include "wtf/FastAllocBase.h"
-#include "wtf/Forward.h"
-#include "wtf/RefPtr.h"
+#include "wtf/Noncopyable.h"
+#include "wtf/OwnPtr.h"
+#include "wtf/PassOwnPtr.h"
+
+namespace blink {
+class WebScrollOffsetAnimationCurve;
+}
 
 namespace WebCore {
 
-class SharedBuffer;
+class ScrollableArea;
 
-// Allows transfer of data in multiple chunks from a SharedBuffer to a provided buffer.
-class SharedBufferReader {
+class ProgrammaticScrollAnimator {
+    WTF_MAKE_NONCOPYABLE(ProgrammaticScrollAnimator);
     WTF_MAKE_FAST_ALLOCATED;
 public:
-    SharedBufferReader(PassRefPtr<SharedBuffer>);
+    static PassOwnPtr<ProgrammaticScrollAnimator> create(ScrollableArea*);
+
+    ~ProgrammaticScrollAnimator();
+
+    void animateToOffset(FloatPoint);
+    void cancelAnimation();
+    void tickAnimation(double monotonicTime);
 
-    ~SharedBufferReader();
+    void notifyAnimationStarted(double monotonicTime);
+    void notifyAnimationFinished(double monotonicTime);
 
-    // Returns the number of bytes that were read (i.e. written to |outputBuffer|).
-    int readData(char* outputBuffer, unsigned askedToRead);
+    void canUseCompositedScrollAnimationsDidChange();
 
 private:
-    RefPtr<SharedBuffer> m_buffer;
-    unsigned m_currentOffset;
+    explicit ProgrammaticScrollAnimator(ScrollableArea*);
+
+    void resetAnimationState();
+
+    ScrollableArea* m_scrollableArea;
+    OwnPtr<blink::WebScrollOffsetAnimationCurve> m_animationCurve;
+    FloatPoint m_targetOffset;
+    int m_animationId;
+    double m_startTime;
 };
 
 } // namespace WebCore
 
-#endif // SharedBufferReader_h
+#endif // ProgrammaticScrollAnimator_h