Implement Element.scrollIntoView for scroll-behavior: smooth.

third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.h

Index: third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.h
diff --git a/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.h b/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.h
index 24f17a566b162376a473503f3114f0801b4bd991..1eb0402c8ca83fd156a5e4f608b699845ff2026a 100644
--- a/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.h
+++ b/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.h
@@ -49,6 +49,7 @@ class Page;
 class PaintLayer;
 class Region;
 class ScrollableArea;
+class ProgrammaticScrollCoordinator;
 class WebLayerTreeView;
 class WebScrollbarLayer;
 
@@ -133,6 +134,8 @@ class CORE_EXPORT ScrollingCoordinator final
     return m_programmaticScrollAnimatorTimeline.get();
   }
 
+  ProgrammaticScrollCoordinator* programmaticScrollCoordinator();
+
   // For testing purposes only. This ScrollingCoordinator is reused between
   // layout test, and must be reset for the results to be valid.
   void reset();
@@ -185,6 +188,8 @@ class CORE_EXPORT ScrollingCoordinator final
   bool m_wasFrameScrollable;
 
   MainThreadScrollingReasons m_lastMainThreadScrollingReasons;
+
+  Member<ProgrammaticScrollCoordinator> m_programmaticScrollCoordinator;

[bokan, 2017/03/28 16:29:53]

We want ScrollingCoordinator to eventually go away. Perhaps Page would be a
better place for this.

[sunyunjia, 2017/04/07 13:53:21]

Done.

 };
 
 }  // namespace blink