Replace various ScrollableArea scroll methods with setScrollPosition

Source/core/frame/PinchViewport.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 225 matching lines @@
     // Keep the center-of-pinch anchor in a stable position over the course
     // of the magnify.
     FloatPoint anchorAtOldScale = anchor.scaledBy(1.f / oldPageScale);
     FloatPoint anchorAtNewScale = anchor.scaledBy(1.f / newPageScale);
     FloatSize anchorDelta = anchorAtOldScale - anchorAtNewScale;
 
     // First try to use the anchor's delta to scroll the FrameView.
     FloatSize anchorDeltaUnusedByScroll = anchorDelta;
     FrameView* view = mainFrame()->view();
     DoublePoint oldPosition = view->scrollPositionDouble();
-    view->scrollBy(DoubleSize(anchorDelta.width(), anchorDelta.height()));
+    view->scrollBy(DoubleSize(anchorDelta.width(), anchorDelta.height()), UserScroll);
     DoublePoint newPosition = view->scrollPositionDouble();
     anchorDeltaUnusedByScroll = anchorDelta - toFloatSize(newPosition - oldPosition);
 
     // Manually bubble any remaining anchor delta up to the pinch viewport.
     FloatPoint newLocation(location() + anchorDeltaUnusedByScroll);
     setScaleAndLocation(newPageScale, newLocation);
     return true;
 }
 
 // Modifies the top of the graphics layer tree to add layers needed to support
@@ skipping 262 matching lines @@
 
     return frame->view()->visibleContentRect(IncludeScrollbars).size();
 }
 
 void PinchViewport::invalidateScrollbarRect(Scrollbar*, const IntRect&)
 {
     // Do nothing. Pinch scrollbars live on the compositor thread and will
     // be updated when the viewport is synced to the CC.
 }
 
-void PinchViewport::setScrollOffset(const IntPoint& offset)
+void PinchViewport::setScrollOffset(const IntPoint& offset, ScrollType scrollType)
 {
-    setScrollOffset(DoublePoint(offset));
+    setScrollOffset(DoublePoint(offset), scrollType);
 }
 
-void PinchViewport::setScrollOffset(const DoublePoint& offset)
+void PinchViewport::setScrollOffset(const DoublePoint& offset, ScrollType)
 {
     setLocation(toFloatPoint(offset));
 }
 
 GraphicsLayer* PinchViewport::layerForContainer() const
 {
     return m_innerViewportContainerLayer.get();
 }
 
 GraphicsLayer* PinchViewport::layerForScrolling() const
@@ skipping 107 matching lines @@
     } else if (graphicsLayer == m_rootTransformLayer) {
         name =  "Root Transform Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink