Fix paint invalidation for composited vertical-rl having overflow

third_party/WebKit/Source/core/layout/LayoutView.cpp

Index: third_party/WebKit/Source/core/layout/LayoutView.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutView.cpp b/third_party/WebKit/Source/core/layout/LayoutView.cpp
index bb9eb0ea9d9fd927f44b756ad3b2879672bcff85..163b080f0a3e9fb01aba8677eb5d5c8385698892 100644
--- a/third_party/WebKit/Source/core/layout/LayoutView.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutView.cpp
@@ -294,7 +294,7 @@ LayoutRect LayoutView::visualOverflowRect() const
     // In normal compositing mode, LayoutView doesn't actually apply clipping
     // on its descendants. Instead their visual overflow is propagated to
     // compositor()->m_rootContentLayer for accelerated scrolling.
-    return LayoutRect(documentRect());
+    return layoutOverflowRect();
 }
 
 LayoutRect LayoutView::localOverflowRectForPaintInvalidation() const
@@ -822,6 +822,7 @@ IntRect LayoutView::documentRect() const
 {
     LayoutRect overflowRect(layoutOverflowRect());
     flipForWritingMode(overflowRect);
+    // TODO(crbug.com/650768): The pixel snapping looks incorect.

[chrishtr, 2016/09/27 18:55:20]

nit: "incorrect"

[Xianzhu, 2016/09/27 20:48:38]

Done.

     return pixelSnappedIntRect(overflowRect);
 }