Replace various ScrollableArea scroll methods with setScrollPosition

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index 5b7842fa68deac801679a6f650775344e28bf1fe..e68f007c35595f9cc4c51a998126f6422b91a37a 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -903,7 +903,7 @@ bool WebViewImpl::startPageScaleAnimation(const IntPoint& targetPosition, bool u
 
             FrameView* view = mainFrameImpl()->frameView();
             if (view && view->scrollableArea())
-                view->scrollableArea()->setScrollPosition(DoublePoint(clampedPoint.x, clampedPoint.y));
+                view->scrollableArea()->setScrollPosition(DoublePoint(clampedPoint.x, clampedPoint.y), ProgrammaticScroll);
 
             return false;
         }
@@ -3063,7 +3063,7 @@ void WebViewImpl::scrollAndRescaleViewports(float scaleFactor,
     // Order is important: pinch viewport location is clamped based on
     // main frame scroll position and pinch viewport scale.
 
-    view->setScrollOffset(mainFrameOrigin);
+    view->setScrollPosition(mainFrameOrigin, ProgrammaticScroll);
 
     setPageScaleFactor(scaleFactor);