Revert of Verify paintedOutputOfObjectHasNoEffectRegardlessOfSize during painting

third_party/WebKit/Source/core/layout/LayoutObject.h

Index: third_party/WebKit/Source/core/layout/LayoutObject.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.h b/third_party/WebKit/Source/core/layout/LayoutObject.h
index 0059bbab5bf8150de2a83382b3129cf08619b873..ffba10ad12132c12d977204fc917d37aeb05a9b8 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.h
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.h
@@ -1309,6 +1309,18 @@
 
   void setShouldDoFullPaintInvalidationIncludingNonCompositingDescendants();
 
+  // Returns true if the object itself will not generate any effective painted
+  // output no matter what size the object is. For example, this function can
+  // return false for an object whose size is currently 0x0 but would have
+  // effective painted output if it was set a non-empty size.
+  // It's used to skip unforced paint invalidation (which is when
+  // shouldDoFullPaintInvalidation is false, but mayNeedPaintInvalidation or
+  // childShouldCheckForPaintInvalidation is true) to avoid unnecessary paint
+  // invalidations of empty areas covered by such objects.
+  virtual bool paintedOutputOfObjectHasNoEffectRegardlessOfSize() const {
+    return false;
+  }
+
   // Returns the rect that should have paint invalidated whenever this object
   // changes. The rect is in the view's coordinate space. This method deals with
   // outlines and overflow.