OverscrollGlow for mainThread-{BLINK CHANGES}

Source/core/layout/LayoutBox.h

Index: Source/core/layout/LayoutBox.h
diff --git a/Source/core/layout/LayoutBox.h b/Source/core/layout/LayoutBox.h
index a79e2cf8961ed3a0cecdb711317d018f265b595a..723a20230874fb1b11a4cceca4bd641e2c48de71 100644
--- a/Source/core/layout/LayoutBox.h
+++ b/Source/core/layout/LayoutBox.h
@@ -90,6 +90,8 @@ public:
     int pixelSnappedWidth() const { return m_frameRect.pixelSnappedWidth(); }
     int pixelSnappedHeight() const { return m_frameRect.pixelSnappedHeight(); }
 
+    IntPoint unUsedDelta() const { return m_unusedDelta; }
+
     void setX(LayoutUnit x)
     {
         if (x == m_frameRect.x())
@@ -827,6 +829,9 @@ private:
     // The width/height of the contents + borders + padding.  The x/y location is relative to our container (which is not always our parent).
     LayoutRect m_frameRect;
 
+    // UnUsed Delta after scroll.
+    IntPoint m_unusedDelta;

[majidvp, 2015/04/23 18:25:08]

It does not make sense to have this information in LayoutBox. Unused scroll
delta needs to only be tracked for main frame and then only
during a single scroll event. I don't think it needs to be a member.

[MuVen, 2015/04/27 12:53:46]

Done.

+
     // Our intrinsic height, used for min-height: min-content etc. Maintained by
     // updateLogicalHeight. This is logicalHeight() before it is clamped to
     // min/max.