Index: cc/trees/layer_tree_host_impl.h |
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h |
index e0539a66a9795e96a95a458d82c763cae76d963e..b5eb7d23bd64e081ffd1fc16fe3dca4917178531 100644 |
--- a/cc/trees/layer_tree_host_impl.h |
+++ b/cc/trees/layer_tree_host_impl.h |
@@ -356,6 +356,7 @@ class CC_EXPORT LayerTreeHostImpl |
void SetNeedsAnimateForScrollbarAnimation() override; |
void SetNeedsRedrawForScrollbarAnimation() override; |
ScrollbarSet ScrollbarsFor(int scroll_layer_id) const override; |
+ void SetScrollbarsHidden(int layer_id, bool hidden) override; |
// VideoBeginFrameSource implementation. |
void AddVideoFrameController(VideoFrameController* controller) override; |
@@ -806,6 +807,11 @@ class CC_EXPORT LayerTreeHostImpl |
std::unordered_map<int, std::unique_ptr<ScrollbarAnimationController>> |
scrollbar_animation_controllers_; |
+ // A map of scroll layers whose scrollbars have been hidden or shown since |
+ // the last commit. This gets cleared every commit so only changes are sent |
+ // back to the main thread. |
+ std::unordered_map<int, bool> scrollbars_hidden_map_; |
+ |
RenderingStatsInstrumentation* rendering_stats_instrumentation_; |
MicroBenchmarkControllerImpl micro_benchmark_controller_; |
std::unique_ptr<SynchronousTaskGraphRunner> |