Fix another inappropriate overscroll glow.

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 072e8e7efbf2d6ae30186f8514e2d47b790961b8..0ac2a0480d5fb12befbc7c200847110adb9ab222 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -2269,7 +2269,7 @@ bool LayerTreeHostImpl::ScrollBy(const gfx::Point& viewport_point,
 
     if (layer_impl == InnerViewportScrollLayer()) {
       unused_root_delta.Subtract(applied_delta);
-      const float kOverscrollEpsilon = 0.01f;
+      const float kOverscrollEpsilon = move_threshold;
       if (std::abs(unused_root_delta.x()) < kOverscrollEpsilon)
         unused_root_delta.set_x(0.0f);
       if (std::abs(unused_root_delta.y()) < kOverscrollEpsilon)
@@ -2315,7 +2315,8 @@ bool LayerTreeHostImpl::ScrollBy(const gfx::Point& viewport_point,
     accumulated_root_overscroll_.set_y(0);
 
   accumulated_root_overscroll_ += unused_root_delta;
-  bool did_overscroll = !unused_root_delta.IsZero();
+  bool did_overscroll =
+      !unused_root_delta.IsZero() && !(did_scroll_x && did_scroll_y);
   if (did_overscroll && input_handler_client_) {
     DidOverscrollParams params;
     params.accumulated_overscroll = accumulated_root_overscroll_;