Handle uncommitted PaintController in DisplayItemClient aliveness tracking

third_party/WebKit/Source/core/frame/FrameView.cpp

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index 2a5c4d143e73884234b4f620d1ef50914e9f5326..56a642dec49b640e4a6fbb1bd43f448f10387641 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -2537,6 +2537,10 @@ void FrameView::synchronizedPaint()
         if (!layoutViewItem.isNull())
             layoutViewItem.layer()->clearNeedsRepaintRecursively();
     });
+
+#if CHECK_DISPLAY_ITEM_CLIENT_ALIVENESS
+    DisplayItemClient::endShouldKeepAliveAllClients();
+#endif
 }
 
 void FrameView::synchronizedPaintRecursively(GraphicsLayer* graphicsLayer)