First step of PaintInvalidator implementation

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

Index: third_party/WebKit/Source/core/layout/LayoutBlockFlowLine.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBlockFlowLine.cpp b/third_party/WebKit/Source/core/layout/LayoutBlockFlowLine.cpp
index 6d210be8a57ddd3f052d37ff2d6940b3ab547535..03b79473ece791291c730efa8d808e6cb86a0767 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBlockFlowLine.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBlockFlowLine.cpp
@@ -2076,18 +2076,7 @@ PaintInvalidationReason LayoutBlockFlow::invalidatePaintIfNeeded(const PaintInva
     if (containsFloats())
         paintInvalidationState.paintingLayer().setNeedsPaintPhaseFloat();
 
-    PaintInvalidationReason reason = LayoutBlock::invalidatePaintIfNeeded(paintInvalidationState);
-    if (reason == PaintInvalidationNone || reason == PaintInvalidationDelayedFull)
-        return reason;
-
-    RootInlineBox* line = firstRootBox();
-    if (!line || !line->isFirstLineStyle())
-        return reason;
-    // It's the RootInlineBox that paints the ::first-line background. Note that since it may be
-    // expensive to figure out if the first line is affected by any ::first-line selectors at all,
-    // we just invalidate it unconditionally, since that's typically cheaper.
-    invalidateDisplayItemClient(*line, reason);
-    return reason;
+    return LayoutBlock::invalidatePaintIfNeeded(paintInvalidationState);
 }
 
 } // namespace blink