Prevent handle MouseUp when mouse is capture a scrollbar

cc/input/scrollbar_animation_controller.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 "cc/input/scrollbar_animation_controller.h"
 
 #include <algorithm>
 
 #include "base/time/time.h"
 #include "cc/trees/layer_tree_impl.h"
@@ skipping 204 matching lines @@
 
 void ScrollbarAnimationController::DidMouseDown() {
   if (!need_thinning_animation_ || ScrollbarsHidden())
     return;
 
   vertical_controller_->DidMouseDown();
   horizontal_controller_->DidMouseDown();
 }
 
 void ScrollbarAnimationController::DidMouseUp() {
-  if (!need_thinning_animation_)
+  if (!need_thinning_animation_ || !Captured())
     return;
 
   vertical_controller_->DidMouseUp();
   horizontal_controller_->DidMouseUp();
 
   if (!mouse_is_near_any_scrollbar())
     PostDelayedFadeOut(false);
 }
 
 void ScrollbarAnimationController::DidMouseLeave() {
@@ skipping 102 matching lines @@
   bool previouslyVisible = opacity_ > 0.0f;
   bool currentlyVisible = opacity > 0.0f;
 
   opacity_ = opacity;
 
   if (previouslyVisible != currentlyVisible)
     client_->DidChangeScrollbarVisibility();
 }
 
 }  // namespace cc