Reset need_trigger_scrollbar_show_ in SAC::DidMouseLeave

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 225 matching lines @@
 }
 
 void ScrollbarAnimationController::DidMouseLeave() {
   if (!need_thinning_animation_)
     return;
 
   vertical_controller_->DidMouseLeave();
   horizontal_controller_->DidMouseLeave();
 
   delayed_scrollbar_show_.Cancel();
+  need_trigger_scrollbar_show_ = false;
 
   if (ScrollbarsHidden() || Captured())
     return;
 
   PostDelayedFadeOut(false);
 }
 
 void ScrollbarAnimationController::DidMouseMoveNear(
     ScrollbarOrientation orientation,
     float distance) {
@@ skipping 110 matching lines @@
   if (opacity_ != opacity)
     client_->SetNeedsRedrawForScrollbarAnimation();
 
   opacity_ = opacity;
 
   if (previouslyVisible != currentlyVisible)
     client_->DidChangeScrollbarVisibility();
 }
 
 }  // namespace cc