Prevent handle MouseUp when mouse is capture a scrollbar

cc/input/scrollbar_animation_controller.cc

Index: cc/input/scrollbar_animation_controller.cc
diff --git a/cc/input/scrollbar_animation_controller.cc b/cc/input/scrollbar_animation_controller.cc
index 6927d0415738fc93435406bdeb0fcd3f8f30db1d..04404d0830c5d3a07eeed68c6de7a668f31b48d1 100644
--- a/cc/input/scrollbar_animation_controller.cc
+++ b/cc/input/scrollbar_animation_controller.cc
@@ -222,7 +222,7 @@ void ScrollbarAnimationController::DidMouseDown() {
 }
 
 void ScrollbarAnimationController::DidMouseUp() {
-  if (!need_thinning_animation_)
+  if (!need_thinning_animation_ || !Captured())
     return;
 
   vertical_controller_->DidMouseUp();