Blink Support for Overlay Scrollbar Animation

Source/core/page/PageAnimator.cpp

 // 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 "config.h"
 #include "core/page/PageAnimator.h"
 
 #include "core/animation/DocumentAnimations.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
@@ skipping 35 matching lines @@
                     (*it)->serviceScrollAnimations(monotonicAnimationStartTime);
             }
         }
     }
 
     for (size_t i = 0; i < documents.size(); ++i) {
         DocumentAnimations::updateAnimationTimingForAnimationFrame(*documents[i], monotonicAnimationStartTime);
         SVGDocumentExtensions::serviceOnAnimationFrame(*documents[i], monotonicAnimationStartTime);
     }
 
-    for (size_t i = 0; i < documents.size(); ++i)
+    for (size_t i = 0; i < documents.size(); ++i) {
         documents[i]->serviceScriptedAnimations(monotonicAnimationStartTime);
+        if (const FrameView::ScrollableAreaSet* scrollableAreas = documents[i]->view()->scrollableAreas()) {
+            for (FrameView::ScrollableAreaSet::iterator it = scrollableAreas->begin(); it != scrollableAreas->end(); ++it)
+                (*it)->serviceScrollbarAnimations();
+        }
+    }
 }
 
 void PageAnimator::scheduleVisualUpdate()
 {
     // FIXME: also include m_animationFramePending here. It is currently not there due to crbug.com/353756.
     if (m_servicingAnimations || m_updatingLayoutAndStyleForPainting)
         return;
     m_page->chrome().scheduleAnimation();
 }
 
@@ skipping 10 matching lines @@
     // setFrameRect(). This will be a quick operation for most frames, but the
     // NativeWindowWidgets will update a proper clipping region.
     view->setFrameRect(view->frameRect());
 
     // setFrameRect may have the side-effect of causing existing page layout to
     // be invalidated, so layout needs to be called last.
     view->updateLayoutAndStyleForPainting();
 }
 
 }