cc: Avoid Crash in Effect Tree Animation by Element ID

cc/trees/property_tree.cc

 // Copyright 2014 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 <stddef.h>
 
 #include <set>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 845 matching lines @@
   auto iterator = property_trees()->element_id_to_effect_node_index.find(id);
   if (iterator == property_trees()->element_id_to_effect_node_index.end())
     return nullptr;
 
   return Node(iterator->second);
 }
 
 bool EffectTree::OnOpacityAnimated(ElementId id, float opacity) {
   EffectNode* node = FindNodeFromElementId(id);
   DCHECK(node);
+  // TODO(crbug.com/706766): Avoid crash. Need more investigation for what is
+  // calling this without setting element id.
+  if (!node)
+    return false;
+
   if (node->opacity == opacity)
     return false;
   node->opacity = opacity;
   node->effect_changed = true;
   property_trees()->changed = true;
   property_trees()->effect_tree.set_needs_update(true);
   return true;
 }
 
 bool EffectTree::OnFilterAnimated(ElementId id,
                                   const FilterOperations& filters) {
   EffectNode* node = FindNodeFromElementId(id);
   DCHECK(node);
+  // TODO(crbug.com/706766): Avoid crash. Need more investigation for what is
+  // calling this without setting element id.
+  if (!node)
+    return false;
+
   if (node->filters == filters)
     return false;
   node->filters = filters;
   node->effect_changed = true;
   property_trees()->changed = true;
   property_trees()->effect_tree.set_needs_update(true);
   return true;
 }
 
 void EffectTree::UpdateEffects(int id) {
@@ skipping 1222 matching lines @@
   const EffectNode* effect_node = effect_tree.Node(effect_id);
 
   if (effect_node->surface_contents_scale.x() != 0.0 &&
       effect_node->surface_contents_scale.y() != 0.0)
     screen_space_transform.Scale(1.0 / effect_node->surface_contents_scale.x(),
                                  1.0 / effect_node->surface_contents_scale.y());
   return screen_space_transform;
 }
 
 }  // namespace cc