Use float for scroll offset.

third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp

Index: third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
index 56503d84012376488405d0cb8e4819c1408d3c84..562380a63cb6511ae7f5e79a4eaaa841a5264e49 100644
--- a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
+++ b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
@@ -1109,14 +1109,10 @@ void GraphicsLayer::setScrollableArea(ScrollableArea* scrollableArea,
 
 void GraphicsLayer::didScroll() {
   if (m_scrollableArea) {
-    DoublePoint newPosition =
-        -m_scrollableArea->scrollOrigin() +
-        toDoubleSize(m_layer->layer()->scrollPositionDouble());
-
-    // FrameView::setScrollPosition doesn't work for compositor commits (interacts poorly with programmatic scroll animations)
-    // so we need to use the ScrollableArea version. The FrameView method should go away soon anyway.
-    m_scrollableArea->ScrollableArea::setScrollPosition(newPosition,
-                                                        CompositorScroll);
+    ScrollOffset newOffset = toScrollOffset(-m_scrollableArea->scrollOrigin()) +
+                             m_layer->layer()->scrollOffset();
+
+    m_scrollableArea->setScrollOffset(newOffset, CompositorScroll);
   }
 }