Check rect under-invalidations

third_party/WebKit/Source/platform/graphics/GraphicsLayer.h

Index: third_party/WebKit/Source/platform/graphics/GraphicsLayer.h
diff --git a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.h b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.h
index d1d72afdafb098a350aaa07a649e911fcd9d9568..d5345355ef7734d59a371a7860b6dfd4e765c0b9 100644
--- a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.h
+++ b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.h
@@ -210,10 +210,19 @@ public:
     // pointers for the layers and timing data will be included in the returned string.
     String layerTreeAsText(LayerTreeFlags = LayerTreeNormal) const;
 
-    bool isTrackingPaintInvalidations() const { return m_client->isTrackingPaintInvalidations(); }
+    void setTracksPaintInvalidations(bool);
+    bool isTrackingOrCheckingPaintInvalidations() const
+    {
+#if DCHECK_IS_ON()
+        if (RuntimeEnabledFeatures::slimmingPaintUnderInvalidationCheckingEnabled())
+            return true;
+#endif
+        return m_isTrackingPaintInvalidations;
+    }
+
     void resetTrackedPaintInvalidations();
     bool hasTrackedPaintInvalidations() const;
-    void trackPaintInvalidation(const DisplayItemClient&, const FloatRect&, PaintInvalidationReason);
+    void trackPaintInvalidation(const DisplayItemClient&, const IntRect&, PaintInvalidationReason);
 
     void addLinkHighlight(LinkHighlight*);
     void removeLinkHighlight(LinkHighlight*);
@@ -292,6 +301,11 @@ private:
     void clearContentsLayerIfUnregistered();
     WebLayer* contentsLayerIfRegistered();
 
+#if DCHECK_IS_ON()
+    PassRefPtr<SkPicture> capturePicture();
+    void checkPaintUnderInvalidations(const SkPicture&);
+#endif
+
     GraphicsLayerClient* m_client;
 
     // Offset from the owning layoutObject
@@ -325,6 +339,8 @@ private:
     bool m_textPainted : 1;
     bool m_imagePainted : 1;
 
+    bool m_isTrackingPaintInvalidations : 1;
+
     GraphicsLayerPaintingPhase m_paintingPhase;
 
     Vector<GraphicsLayer*> m_children;