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

cc/layers/layer_impl_unittest.cc

 // Copyright 2011 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/layers/layer_impl.h"
 
 #include "cc/layers/painted_scrollbar_layer_impl.h"
 #include "cc/output/filter_operation.h"
 #include "cc/output/filter_operations.h"
 #include "cc/test/fake_impl_proxy.h"
@@ skipping 484 matching lines @@
   EXPECT_VECTOR_EQ(scroll_offset, layer()->scroll_offset());
 }
 
 class ScrollDelegateIgnore : public LayerImpl::ScrollOffsetDelegate {
  public:
   void SetTotalScrollOffset(const gfx::ScrollOffset& new_value) override {}
   gfx::ScrollOffset GetTotalScrollOffset() override {
     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;
   }
 
  private:
   gfx::Vector2dF fixed_offset_;
 };
 
 TEST_F(LayerImplScrollTest, ScrollByWithIgnoringDelegate) {
@@ skipping 29 matching lines @@
   EXPECT_VECTOR_EQ(scroll_offset, layer()->scroll_offset());
 }
 
 class ScrollDelegateAccept : public LayerImpl::ScrollOffsetDelegate {
  public:
   void SetTotalScrollOffset(const gfx::ScrollOffset& new_value) override {
     current_offset_ = new_value;
   }
   gfx::ScrollOffset GetTotalScrollOffset() override { return current_offset_; }
   bool IsExternalFlingActive() const override { return false; }
+  void Update() const override { }
 
  private:
   gfx::ScrollOffset current_offset_;
 };
 
 TEST_F(LayerImplScrollTest, ScrollByWithAcceptingDelegate) {
   gfx::ScrollOffset scroll_offset(10, 5);
   layer()->SetScrollOffset(scroll_offset);
 
   EXPECT_VECTOR_EQ(scroll_offset, layer()->TotalScrollOffset());
@@ skipping 129 matching lines @@
       layer()->id(), tree()->root_layer()->id());
 
   int expected_horizontal_maximum =
       layer()->bounds().width() - tree()->root_layer()->bounds().width();
   EXPECT_EQ(expected_horizontal_maximum, horizontal_scrollbar->maximum());
   EXPECT_EQ(scroll_offset.x(), horizontal_scrollbar->current_pos());
 }
 
 }  // namespace
 }  // namespace cc