Delay scrollContents until the next paint

Source/platform/scroll/ScrollView.cpp

Index: Source/platform/scroll/ScrollView.cpp
diff --git a/Source/platform/scroll/ScrollView.cpp b/Source/platform/scroll/ScrollView.cpp
index 4b778ab6951c066d3e4ed868b0a655f81cec7463..17d6860d6738efb7e143d34351af724566231ffc 100644
--- a/Source/platform/scroll/ScrollView.cpp
+++ b/Source/platform/scroll/ScrollView.cpp
@@ -274,8 +274,10 @@ void ScrollView::scrollTo(const IntSize& newOffset)
     if (scrollbarsSuppressed())
         return;
 
+    m_scrollDelta += scrollDelta;
+
+    // invalidateFixedElementsBeforeScrolling(scrollDelta, rectToCopyOnScroll());

[abarth-chromium, 2014/03/08 06:54:52]

I couldn't find where we actually call this function.  Do you intend to comment
it out here?

[ykyyip, 2014/03/11 01:59:39]

Yes, I actually don't need this function with the changes in
RenderView::computeRectForRepaint. I will remove this code.

     repaintFixedElementsAfterScrolling();
-    scrollContents(scrollDelta);
     updateFixedElementsAfterScrolling();
 }
 
@@ -515,6 +517,14 @@ IntRect ScrollView::rectToCopyOnScroll() const
     return scrollViewRect;
 }
 
+void ScrollView::scrollContentsIfNeeded()
+{
+    if (m_scrollDelta.isZero())
+        return;
+    scrollContents(m_scrollDelta);
+    m_scrollDelta = IntSize();
+}
+
 void ScrollView::scrollContents(const IntSize& scrollDelta)
 {
     HostWindow* window = hostWindow();