Scrollbar fade animation broken on Android regression resolved.

cc/trees/layer_tree_host_impl.h

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 ccbd9e7393ee42373e8fea65dfebf6b39727e481..2c922b8f6de449cd6b3724d623c7c4a5870b40a2 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -697,6 +697,13 @@ class CC_EXPORT LayerTreeHostImpl
   void SetCompositorContextVisibility(bool is_visible);
   void SetWorkerContextVisibility(bool is_visible);
 
+  // Cache & restore variables that get reset in ClearCurrentlyScrollingLayer.
+  // This is used to restore the variables' values in a scrollBegin event
+  // that is in inertial phase (a fling) to lach the event to its corresponding

[tdresser, 2016/10/19 15:28:04]

lach -> latch.

[sahel, 2016/10/25 15:34:14]

Done.

+  // scroll.

[tdresser, 2016/10/19 15:28:04]

scroll -> scroller.

[sahel, 2016/10/25 15:34:14]

Done.

+  void CacheScrollingVariablesState();

[tdresser, 2016/10/19 15:28:04]

Can we come up with a more specific name than "ScrollingVariables"? There are
other scrolling related variables that aren't included here.

[sahel, 2016/10/25 15:34:14]

You are right, but I couldn't come up with a better name, because the cached
variables are not related to each other. I would appreciate any ideas/help here.

[bokan, 2016/10/25 17:29:21]

How about CacheScrollStateForFling (FlingContinuation? EnsuingFling?
SubsequentFling?) and calling the class ScrollStateForFling?

[sahel, 2016/10/26 14:11:43]

Done.

+  void RestoreCachedScrollingVariablesState();
+
   using UIResourceMap = std::unordered_map<UIResourceId, UIResourceData>;
   UIResourceMap ui_resource_map_;