Revert of Use element id's for animations

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 189 matching lines @@
   host_impl.active_tree()->property_trees()->needs_rebuild = true;
   host_impl.active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   root->SetMasksToBounds(true);
   host_impl.active_tree()->property_trees()->needs_rebuild = true;
   host_impl.active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   // Changing these properties does not cause the layer to be marked as changed
   // but does cause the layer to need to push properties.
   EXECUTE_AND_VERIFY_NEEDS_PUSH_PROPERTIES_AND_SUBTREE_DID_NOT_CHANGE(
-      root->SetElementId(ElementId(2, 0)));
+      root->SetElementId(2));
   EXECUTE_AND_VERIFY_NEEDS_PUSH_PROPERTIES_AND_SUBTREE_DID_NOT_CHANGE(
       root->SetMutableProperties(MutableProperty::kOpacity));
 
   // After setting all these properties already, setting to the exact same
   // values again should not cause any change.
   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(root->SetMasksToBounds(true));
   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(
       root->SetPosition(arbitrary_point_f));
   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(root->Set3dSortingContextId(1));
   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(
@@ skipping 124 matching lines @@
   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetDrawsContent(true));
   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(
       layer->SetBackgroundColor(arbitrary_color));
   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(
       layer->SetBackgroundFilters(arbitrary_filters));
   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(
       layer->SetBlendMode(arbitrary_blend_mode));
   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(
       layer->SetTransform(arbitrary_transform));
   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetBounds(arbitrary_size));
-  VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetElementId(ElementId(2, 0)));
+  VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetElementId(2));
   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(
       layer->SetMutableProperties(MutableProperty::kTransform));
 }
 
 TEST(LayerImplTest, SafeOpaqueBackgroundColor) {
   FakeImplTaskRunnerProvider task_runner_provider;
   TestSharedBitmapManager shared_bitmap_manager;
   TestTaskGraphRunner task_graph_runner;
   std::unique_ptr<OutputSurface> output_surface = FakeOutputSurface::Create3d();
   FakeLayerTreeHostImpl host_impl(&task_runner_provider, &shared_bitmap_manager,
@@ skipping 204 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