Fix under-invalidation of media buffered ranges

third_party/WebKit/Source/core/paint/BoxPainter.cpp

Index: third_party/WebKit/Source/core/paint/BoxPainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/BoxPainter.cpp b/third_party/WebKit/Source/core/paint/BoxPainter.cpp
index 8018fbde2898f03faef02d3d739bd4cc220de992..d9b751983bdc767ef174b3fb6cdd1ace3ee3f58b 100644
--- a/third_party/WebKit/Source/core/paint/BoxPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/BoxPainter.cpp
@@ -103,16 +103,12 @@ void BoxPainter::paintBoxDecorationBackgroundWithRect(const PaintInfo& paintInfo
     bool paintingOverflowContents = isPaintingBackgroundOfPaintContainerIntoScrollingContentsLayer(&m_layoutBox, paintInfo);
     const ComputedStyle& style = m_layoutBox.styleRef();
 
-    // FIXME: For now we don't have notification on media buffered range change from media player
-    // and miss paint invalidation on buffered range change. crbug.com/484288.
+    // We may paint a delayed-invalidation object before it's actually invalidated. Note this would be handled for
+    // us by LayoutObjectDrawingRecorder but we have to use DrawingRecorder as we may use the scrolling contents
+    // layer as DisplayItemClient below.
     Optional<DisplayItemCacheSkipper> cacheSkipper;
-    if (style.appearance() == MediaSliderPart
-        // We may paint a delayed-invalidation object before it's actually invalidated. Note this would be handled for
-        // us by LayoutObjectDrawingRecorder but we have to use DrawingRecorder as we may use the scrolling contents
-        // layer as DisplayItemClient below.
-        || m_layoutBox.fullPaintInvalidationReason() == PaintInvalidationDelayedFull) {
+    if (m_layoutBox.fullPaintInvalidationReason() == PaintInvalidationDelayedFull)
         cacheSkipper.emplace(paintInfo.context);
-    }
 
     const DisplayItemClient& displayItemClient = paintingOverflowContents ? static_cast<const DisplayItemClient&>(*m_layoutBox.layer()->compositedLayerMapping()->scrollingContentsLayer()) : m_layoutBox;
     if (DrawingRecorder::useCachedDrawingIfPossible(paintInfo.context, displayItemClient, DisplayItem::BoxDecorationBackground))