Back PaintRecord with PaintOpBuffer instead of SkPicture

third_party/WebKit/public/platform/WebScrollbarThemePainter.h

Index: third_party/WebKit/public/platform/WebScrollbarThemePainter.h
diff --git a/third_party/WebKit/public/platform/WebScrollbarThemePainter.h b/third_party/WebKit/public/platform/WebScrollbarThemePainter.h
index b46df87ae6e077271bd28207536548e7a9c3fcc0..8f4bda25f02b1bce357b834813b10cae455c66d5 100644
--- a/third_party/WebKit/public/platform/WebScrollbarThemePainter.h
+++ b/third_party/WebKit/public/platform/WebScrollbarThemePainter.h
@@ -80,6 +80,10 @@ class WebScrollbarThemePainter {
                                                  float deviceScaleFactor);
 #endif
 
+  BLINK_PLATFORM_EXPORT float deviceScaleFactor() const {
+    return m_deviceScaleFactor;
+  }
+
  private:
   // The theme is not owned by this class. It is assumed that the theme is a
   // static pointer and its lifetime is essentially infinite. The functions