Paint state transition for overlay 9 patch scrollbars

content/child/webthemeengine_impl_default.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/child/webthemeengine_impl_default.h"
 
 #include "skia/ext/platform_canvas.h"
 #include "third_party/WebKit/public/platform/WebRect.h"
 #include "third_party/WebKit/public/platform/WebSize.h"
 #include "ui/native_theme/native_theme.h"
@@ skipping 166 matching lines @@
   GetNativeThemeExtraParams(
       part, state, extra_params, &native_theme_extra_params);
   ui::NativeTheme::instance()->Paint(
       canvas,
       NativeThemePart(part),
       NativeThemeState(state),
       gfx::Rect(rect),
       native_theme_extra_params);
 }
 
+void WebThemeEngineImpl::paintStateTransition(blink::WebCanvas* canvas,
+                                              WebThemeEngine::Part part,
+                                              WebThemeEngine::State startState,
+                                              WebThemeEngine::State endState,
+                                              double progress,
+                                              const blink::WebRect& rect) {
+  ui::NativeTheme::instance()->PaintStateTransition(
+      canvas,
+      NativeThemePart(part),
+      NativeThemeState(startState),
+      NativeThemeState(endState),
+      progress,
+      gfx::Rect(rect));
+}
+
 }  // namespace content