Scale scrollbar in use-zoom-for-dsf mode

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 0cf202f7f0ed9c1afe03aeacaca0b12e4176bfa1..c8911dedb6b22658f5ea8dbb55d87a238f5434db 100644
--- a/third_party/WebKit/Source/platform/scroll/Scrollbar.h
+++ b/third_party/WebKit/Source/platform/scroll/Scrollbar.h
@@ -38,6 +38,7 @@
 namespace blink {
 
 class GraphicsContext;
+class HostWindow;
 class IntRect;
 class PlatformGestureEvent;
 class PlatformMouseEvent;
@@ -47,7 +48,7 @@ class ScrollbarTheme;
 
 class PLATFORM_EXPORT Scrollbar : public Widget, public ScrollbarThemeClient {
 public:
-    static PassRefPtrWillBeRawPtr<Scrollbar> create(ScrollableArea*, ScrollbarOrientation, ScrollbarControlSize);
+    static PassRefPtrWillBeRawPtr<Scrollbar> create(ScrollableArea*, ScrollbarOrientation, ScrollbarControlSize, HostWindow*);
 
     // Theme object ownership remains with the caller and it must outlive the scrollbar.
     static PassRefPtrWillBeRawPtr<Scrollbar> createForTesting(ScrollableArea*, ScrollbarOrientation, ScrollbarControlSize, ScrollbarTheme*);
@@ -164,7 +165,7 @@ public:
     DECLARE_VIRTUAL_TRACE();
 
 protected:
-    Scrollbar(ScrollableArea*, ScrollbarOrientation, ScrollbarControlSize, ScrollbarTheme* = 0);
+    Scrollbar(ScrollableArea*, ScrollbarOrientation, ScrollbarControlSize, HostWindow* = 0, ScrollbarTheme* = 0);
 
     void updateThumb();