Update from chromium https://crrev.com/301315

cc/layers/layer_impl_unittest.cc

Index: cc/layers/layer_impl_unittest.cc
diff --git a/cc/layers/layer_impl_unittest.cc b/cc/layers/layer_impl_unittest.cc
index 8d120bef621d19b9f40f424451858278f6ed743b..99673f6146b7495e83cbf4279c58cf2308d6698f 100644
--- a/cc/layers/layer_impl_unittest.cc
+++ b/cc/layers/layer_impl_unittest.cc
@@ -502,6 +502,7 @@ class ScrollDelegateIgnore : public LayerImpl::ScrollOffsetDelegate {
     return gfx::ScrollOffset(fixed_offset_);
   }
   bool IsExternalFlingActive() const override { return false; }
+  void Update() const override { }
 
   void set_fixed_offset(const gfx::Vector2dF& fixed_offset) {
     fixed_offset_ = fixed_offset;
@@ -551,6 +552,7 @@ class ScrollDelegateAccept : public LayerImpl::ScrollOffsetDelegate {
   }
   gfx::ScrollOffset GetTotalScrollOffset() override { return current_offset_; }
   bool IsExternalFlingActive() const override { return false; }
+  void Update() const override { }
 
  private:
   gfx::ScrollOffset current_offset_;