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 00bc234084636803e37c5bb5c78fd852dc77e77b..57d4d49aeb14e589d9969e066963ef5e06990dfd 100644
--- a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
+++ b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
@@ -1178,14 +1178,12 @@ void GraphicsLayer::setScrollableArea(ScrollableArea* scrollableArea,
 
 void GraphicsLayer::didScroll() {
   if (m_scrollableArea) {
-    DoublePoint newPosition =
-        -m_scrollableArea->scrollOrigin() +
-        toDoubleSize(m_layer->layer()->scrollPositionDouble());
+    ScrollOffset newOffset = toScrollOffset(-m_scrollableArea->scrollOrigin()) +
+                             m_layer->layer()->scrollOffset();
 
     // 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.

[bokan, 2016/10/02 19:47:51]

Remove comment

[szager1, 2016/10/05 07:43:36]

Done.

-    m_scrollableArea->ScrollableArea::setScrollPosition(newPosition,
-                                                        CompositorScroll);
+    m_scrollableArea->setScrollOffset(newOffset, CompositorScroll);
   }
 }