Fixed pos objects are offset from the top of the page in paged media

third_party/WebKit/Source/platform/geometry/LayoutPoint.h

Index: third_party/WebKit/Source/platform/geometry/LayoutPoint.h
diff --git a/third_party/WebKit/Source/platform/geometry/LayoutPoint.h b/third_party/WebKit/Source/platform/geometry/LayoutPoint.h
index 9f178095610d52ec9747d6b22934fc0512dbf388..412dec3b6c8ba1ed3acb07db146aac49fe1941fd 100644
--- a/third_party/WebKit/Source/platform/geometry/LayoutPoint.h
+++ b/third_party/WebKit/Source/platform/geometry/LayoutPoint.h
@@ -110,6 +110,11 @@ inline LayoutPoint& operator+=(LayoutPoint& a, const IntSize& b) {
   return a;
 }
 
+ALWAYS_INLINE LayoutPoint& operator-=(LayoutPoint& a, const LayoutPoint& b) {
+  a.move(-b.x(), -b.y());
+  return a;
+}
+
 ALWAYS_INLINE LayoutPoint& operator-=(LayoutPoint& a, const LayoutSize& b) {
   a.move(-b.width(), -b.height());
   return a;