Remove owning_id from EffectNode and replace it by an opaque stable_id

cc/test/layer_tree_json_parser_unittest.cc

Index: cc/test/layer_tree_json_parser_unittest.cc
diff --git a/cc/test/layer_tree_json_parser_unittest.cc b/cc/test/layer_tree_json_parser_unittest.cc
index 9b0477a035ca7e6c9adfd403d2665aab2ae8c146..7c6591a22780ecd898fbefe5dfe58edf9ccca05c 100644
--- a/cc/test/layer_tree_json_parser_unittest.cc
+++ b/cc/test/layer_tree_json_parser_unittest.cc
@@ -11,7 +11,9 @@
 #include "cc/test/fake_layer_tree_host.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
 #include "cc/test/geometry_test_utils.h"
+#include "cc/test/layer_test_common.h"
 #include "cc/test/test_task_graph_runner.h"
+#include "cc/trees/effect_node.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
@@ -40,8 +42,9 @@ bool LayerTreesMatch(LayerImpl* const layer_impl,
                                         layer->contents_opaque()));
   RETURN_IF_EXPECTATION_FAILS(EXPECT_EQ(layer_impl->scrollable(),
                                         layer->scrollable()));
+
   RETURN_IF_EXPECTATION_FAILS(
-      EXPECT_FLOAT_EQ(layer_impl->Opacity(), layer->opacity()));
+      EXPECT_FLOAT_EQ(OpacityForLayer(layer_impl), layer->opacity()));
   RETURN_IF_EXPECTATION_FAILS(
       EXPECT_EQ(layer_impl->touch_event_handler_region(),
                 layer->touch_event_handler_region()));