Mark when we may have been invalidated to early out on repaintTreeAfterLayout.

Source/core/rendering/RenderBlockFlow.cpp

Index: Source/core/rendering/RenderBlockFlow.cpp
diff --git a/Source/core/rendering/RenderBlockFlow.cpp b/Source/core/rendering/RenderBlockFlow.cpp
index 8e0b0e212ea6853508531de0777fdd7f092e133b..aaf7e18481ec9cdad33b14a6eed971a73d54f05a 100644
--- a/Source/core/rendering/RenderBlockFlow.cpp
+++ b/Source/core/rendering/RenderBlockFlow.cpp
@@ -2316,6 +2316,9 @@ bool RenderBlockFlow::positionNewFloats()
 
         RenderBox* childBox = floatingObject->renderer();
 
+        // FIXME Investigate if this can be removed. crbug.com/370006
+        childBox->setMayNeedInvalidation(true);
+
         LayoutUnit childLogicalLeftMargin = style()->isLeftToRightDirection() ? marginStartForChild(childBox) : marginEndForChild(childBox);
         LayoutRect oldRect = childBox->frameRect();