Revert of Calculate paint invalidation rect for scrollbars

third_party/WebKit/Source/platform/scroll/Scrollbar.h

Index: third_party/WebKit/Source/platform/scroll/Scrollbar.h
diff --git a/third_party/WebKit/Source/platform/scroll/Scrollbar.h b/third_party/WebKit/Source/platform/scroll/Scrollbar.h
index 0ec1b88e8a8197190e3287423addafd2e9c8618f..4f6596d06935f5de54000c24b51eb0e51b686528 100644
--- a/third_party/WebKit/Source/platform/scroll/Scrollbar.h
+++ b/third_party/WebKit/Source/platform/scroll/Scrollbar.h
@@ -65,6 +65,9 @@
     void setFrameRect(const IntRect&) override;
     IntRect frameRect() const override { return Widget::frameRect(); }
 
+    void invalidate() override { Widget::invalidate(); }
+    void invalidateRect(const IntRect&) override;
+
     ScrollbarOverlayStyle scrollbarOverlayStyle() const override;
     void getTickmarks(Vector<IntRect>&) const override;
     bool isScrollableAreaActive() const override;
@@ -126,6 +129,9 @@
 
     ScrollbarTheme* theme() const { return m_theme; }
 
+    bool suppressInvalidation() const { return m_suppressInvalidation; }
+    void setSuppressInvalidation(bool s) { m_suppressInvalidation = s; }
+
     IntRect convertToContainingView(const IntRect&) const override;
     IntRect convertFromContainingView(const IntRect&) const override;
 
@@ -145,8 +151,6 @@
 
     DisplayItemClient displayItemClient() const override { return toDisplayItemClient(this); }
     String debugName() const override { return m_orientation == HorizontalScrollbar ? "HorizontalScrollbar" : "VerticalScrollbar"; }
-
-    void setNeedsPaintInvalidation();
 
     // Promptly unregister from the theme manager + run finalizers of derived Scrollbars.
     EAGERLY_FINALIZE();
@@ -191,6 +195,8 @@
     Timer<Scrollbar> m_scrollTimer;
     bool m_overlapsResizer;
 
+    bool m_suppressInvalidation;
+
     bool m_isAlphaLocked;
 
     float m_elasticOverscroll;
@@ -198,9 +204,6 @@
 private:
     bool isScrollbar() const override { return true; }
 
-    void invalidate() override { setNeedsPaintInvalidation(); }
-    void invalidateRect(const IntRect&) override { setNeedsPaintInvalidation(); }
-
     float scrollableAreaCurrentPos() const;
 };