Refactor ScrollableArea::setScrollPosition.

third_party/WebKit/Source/core/frame/RootFrameViewport.cpp

Index: third_party/WebKit/Source/core/frame/RootFrameViewport.cpp
diff --git a/third_party/WebKit/Source/core/frame/RootFrameViewport.cpp b/third_party/WebKit/Source/core/frame/RootFrameViewport.cpp
index 509cc8627efd3f1f5cdfacd2f5610235bb648734..a0ccb201b4ff0917e0f1f6ca37f8c308fe95488a 100644
--- a/third_party/WebKit/Source/core/frame/RootFrameViewport.cpp
+++ b/third_party/WebKit/Source/core/frame/RootFrameViewport.cpp
@@ -207,14 +207,14 @@ LayoutRect RootFrameViewport::scrollIntoView(const LayoutRect& rectInContent,
   return rectInContent;
 }
 
-void RootFrameViewport::setScrollOffset(const DoublePoint& offset,
-                                        ScrollType scrollType) {
-  distributeScrollBetweenViewports(DoublePoint(offset), scrollType,
+void RootFrameViewport::updateScrollPosition(const DoublePoint& position,
+                                             ScrollType scrollType) {
+  distributeScrollBetweenViewports(DoublePoint(position), scrollType,
                                    ScrollBehaviorInstant, VisualViewport);
 }
 
 void RootFrameViewport::distributeScrollBetweenViewports(
-    const DoublePoint& offset,
+    const DoublePoint& position,
     ScrollType scrollType,
     ScrollBehavior behavior,
     ViewportToScrollFirst scrollFirst) {
@@ -222,7 +222,7 @@ void RootFrameViewport::distributeScrollBetweenViewports(
   // ScrollableArea's position may have the fractional part truncated off.
   DoublePoint oldPosition = scrollOffsetFromScrollAnimators();
 
-  DoubleSize delta = offset - oldPosition;
+  DoubleSize delta = position - oldPosition;
 
   if (delta.isZero())
     return;