cc: Impl thread scroll on ScrollNode instead of LayerImpl

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/animation/mutable_properties.h"
 #include "cc/layers/painted_scrollbar_layer_impl.h"
 #include "cc/layers/solid_color_scrollbar_layer_impl.h"
 #include "cc/output/filter_operation.h"
@@ skipping 615 matching lines @@
   EXPECT_VECTOR_EQ(
       gfx::ScrollOffsetWithDelta(scroll_offset, sent_scroll_delta),
       scroll_tree(layer())->GetScrollOffsetBaseForTesting(layer()->id()));
 }
 
 TEST_F(LayerImplScrollTest, ScrollUserUnscrollableLayer) {
   gfx::ScrollOffset scroll_offset(10, 5);
   gfx::Vector2dF scroll_delta(20.5f, 8.5f);
 
   layer()->set_user_scrollable_vertical(false);
+  layer()->layer_tree_impl()->property_trees()->needs_rebuild = true;
+  layer()->layer_tree_impl()->BuildPropertyTreesForTesting();
   scroll_tree(layer())->UpdateScrollOffsetBaseForTesting(layer()->id(),
                                                          scroll_offset);
   gfx::Vector2dF unscrolled = layer()->ScrollBy(scroll_delta);
 
   EXPECT_VECTOR_EQ(gfx::Vector2dF(0, 8.5f), unscrolled);
   EXPECT_VECTOR_EQ(gfx::Vector2dF(30.5f, 5), layer()->CurrentScrollOffset());
 }
 
 TEST_F(LayerImplScrollTest, PushPropertiesToMirrorsCurrentScrollOffset) {
   gfx::ScrollOffset scroll_offset(10, 5);
@@ skipping 18 matching lines @@
 
   pending_layer->PushPropertiesTo(layer());
 
   EXPECT_VECTOR_EQ(gfx::Vector2dF(22, 23), layer()->CurrentScrollOffset());
   EXPECT_VECTOR_EQ(layer()->CurrentScrollOffset(),
                    pending_layer->CurrentScrollOffset());
 }
 
 }  // namespace
 }  // namespace cc