Revert of Compute if a layer is drawn without LayerTree hierarchy

cc/trees/property_tree.cc

Index: cc/trees/property_tree.cc
diff --git a/cc/trees/property_tree.cc b/cc/trees/property_tree.cc
index 00c620b533e4cfd9bf0ee72775be646d9bb97191..64209e936ba1423418c2ce0ea9a5ea4ea9a6b876 100644
--- a/cc/trees/property_tree.cc
+++ b/cc/trees/property_tree.cc
@@ -415,10 +415,6 @@ EffectNodeData::EffectNodeData()
     : opacity(1.f),
       screen_space_opacity(1.f),
       has_render_surface(false),
-      has_copy_request(false),
-      has_background_filters(false),
-      is_drawn(true),
-      screen_space_opacity_is_animating(false),
       num_copy_requests_in_subtree(0),
       transform_id(0),
       clip_id(0) {}
@@ -427,11 +423,6 @@ bool EffectNodeData::operator==(const EffectNodeData& other) const {
   return opacity == other.opacity &&
          screen_space_opacity == other.screen_space_opacity &&
          has_render_surface == other.has_render_surface &&
-         has_copy_request == other.has_copy_request &&
-         has_background_filters == other.has_background_filters &&
-         is_drawn == other.is_drawn &&
-         screen_space_opacity_is_animating ==
-             other.screen_space_opacity_is_animating &&
          num_copy_requests_in_subtree == other.num_copy_requests_in_subtree &&
          transform_id == other.transform_id && clip_id == other.clip_id;
 }
@@ -442,11 +433,6 @@ void EffectNodeData::ToProtobuf(proto::TreeNode* proto) const {
   data->set_opacity(opacity);
   data->set_screen_space_opacity(screen_space_opacity);
   data->set_has_render_surface(has_render_surface);
-  data->set_has_copy_request(has_copy_request);
-  data->set_has_background_filters(has_background_filters);
-  data->set_is_drawn(is_drawn);
-  data->set_screen_space_opacity_is_animating(
-      screen_space_opacity_is_animating);
   data->set_num_copy_requests_in_subtree(num_copy_requests_in_subtree);
   data->set_transform_id(transform_id);
   data->set_clip_id(clip_id);
@@ -459,10 +445,6 @@ void EffectNodeData::FromProtobuf(const proto::TreeNode& proto) {
   opacity = data.opacity();
   screen_space_opacity = data.screen_space_opacity();
   has_render_surface = data.has_render_surface();
-  has_copy_request = data.has_copy_request();
-  has_background_filters = data.has_background_filters();
-  is_drawn = data.is_drawn();
-  screen_space_opacity_is_animating = data.screen_space_opacity_is_animating();
   num_copy_requests_in_subtree = data.num_copy_requests_in_subtree();
   transform_id = data.transform_id();
   clip_id = data.clip_id();
@@ -1093,53 +1075,16 @@ void EffectTree::UpdateOpacities(EffectNode* node, EffectNode* parent_node) {
     node->data.screen_space_opacity *= parent_node->data.screen_space_opacity;
 }
 
-void EffectTree::UpdateIsDrawn(EffectNode* node, EffectNode* parent_node) {
-  // Nodes that have screen space opacity 0 are hidden. So they are not drawn.
-  // Exceptions:
-  // 1) Nodes that contribute to copy requests, whether hidden or not, must be
-  //    drawn.
-  // 2) Nodes that have a background filter.
-  // 3) Nodes with animating screen space opacity.
-  if (node->data.has_copy_request ||
-      node->data.screen_space_opacity_is_animating ||
-      node->data.has_background_filters)
-    node->data.is_drawn = true;
-  else if (node->data.opacity == 0.f)
-    node->data.is_drawn = false;
-  else if (parent_node)
-    node->data.is_drawn = parent_node->data.is_drawn;
-  else
-    node->data.is_drawn = true;
-}
-
 void EffectTree::UpdateEffects(int id) {
   EffectNode* node = Node(id);
   EffectNode* parent_node = parent(node);
 
   UpdateOpacities(node, parent_node);
-  UpdateIsDrawn(node, parent_node);
 }
 
 void EffectTree::ClearCopyRequests() {
-  for (auto& node : nodes()) {
+  for (auto& node : nodes())
     node.data.num_copy_requests_in_subtree = 0;
-    node.data.has_copy_request = false;
-  }
-  set_needs_update(true);
-}
-
-bool EffectTree::ContributesToDrawnSurface(int id) {
-  // All drawn nodes contribute to drawn surface.
-  // Exception : Nodes that are hidden and are drawn only for the sake of
-  // copy requests.
-  EffectNode* node = Node(id);
-  EffectNode* parent_node = parent(node);
-  bool contributes_to_drawn_surface =
-      node->data.is_drawn &&
-      (node->data.opacity != 0.f || node->data.has_background_filters);
-  if (parent_node && !parent_node->data.is_drawn)
-    contributes_to_drawn_surface = false;
-  return contributes_to_drawn_surface;
 }
 
 void TransformTree::UpdateNodeAndAncestorsHaveIntegerTranslations(