Increment property tree sequence number when updating.

third_party/WebKit/Source/platform/graphics/compositing/PropertyTreeManager.cpp

 // Copyright 2015 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 "platform/graphics/compositing/PropertyTreeManager.h"
 
 #include "cc/layers/layer.h"
 #include "cc/trees/clip_node.h"
 #include "cc/trees/effect_node.h"
 #include "cc/trees/layer_tree_host.h"
@@ skipping 15 matching lines @@
 
 static constexpr int kInvalidNodeId = -1;
 // cc's property trees use 0 for the root node (always non-null).
 static constexpr int kRealRootNodeId = 0;
 // cc allocates special nodes for root effects such as the device scale.
 static constexpr int kSecondaryRootNodeId = 1;
 
 }  // namespace
 
 PropertyTreeManager::PropertyTreeManager(cc::PropertyTrees& propertyTrees,
-                                         cc::Layer* rootLayer)
-    : m_propertyTrees(propertyTrees), m_rootLayer(rootLayer) {
+                                         cc::Layer* rootLayer,
+                                         int sequenceNumber)
+    : m_propertyTrees(propertyTrees),
+      m_rootLayer(rootLayer),
+      m_sequenceNumber(sequenceNumber) {
   setupRootTransformNode();
   setupRootClipNode();
   setupRootEffectNode();
   setupRootScrollNode();
 }
 
 cc::TransformTree& PropertyTreeManager::transformTree() {
   return m_propertyTrees.transform_tree;
 }
 
@@ skipping 136 matching lines @@
   compositorNode.needs_local_transform_update = true;
   compositorNode.flattens_inherited_transform =
       transformNode->flattensInheritedTransform();
   compositorNode.sorting_context_id = transformNode->renderingContextId();
 
   m_rootLayer->AddChild(dummyLayer);
   dummyLayer->SetTransformTreeIndex(id);
   dummyLayer->SetClipTreeIndex(kSecondaryRootNodeId);
   dummyLayer->SetEffectTreeIndex(kSecondaryRootNodeId);
   dummyLayer->SetScrollTreeIndex(kRealRootNodeId);
-  dummyLayer->set_property_tree_sequence_number(kPropertyTreeSequenceNumber);
+  dummyLayer->set_property_tree_sequence_number(m_sequenceNumber);
   CompositorElementId compositorElementId =
       transformNode->compositorElementId();
   if (compositorElementId) {
     m_propertyTrees.element_id_to_transform_node_index[compositorElementId] =
         id;
   }
 
   auto result = m_transformNodeMap.set(transformNode, id);
   DCHECK(result.isNewEntry);
   transformTree().set_needs_update(true);
@@ skipping 32 matching lines @@
   compositorNode.target_effect_id = kSecondaryRootNodeId;
   compositorNode.clip_type = cc::ClipNode::ClipType::APPLIES_LOCAL_CLIP;
   compositorNode.layers_are_clipped = true;
   compositorNode.layers_are_clipped_when_surfaces_disabled = true;
 
   m_rootLayer->AddChild(dummyLayer);
   dummyLayer->SetTransformTreeIndex(compositorNode.transform_id);
   dummyLayer->SetClipTreeIndex(id);
   dummyLayer->SetEffectTreeIndex(kSecondaryRootNodeId);
   dummyLayer->SetScrollTreeIndex(kRealRootNodeId);
-  dummyLayer->set_property_tree_sequence_number(kPropertyTreeSequenceNumber);
+  dummyLayer->set_property_tree_sequence_number(m_sequenceNumber);
 
   auto result = m_clipNodeMap.set(clipNode, id);
   DCHECK(result.isNewEntry);
   clipTree().set_needs_update(true);
   return id;
 }
 
 int PropertyTreeManager::ensureCompositorScrollNode(
     const ScrollPaintPropertyNode* scrollNode) {
   DCHECK(scrollNode);
@@ skipping 187 matching lines @@
   effectNode.blend_mode = nextEffect->blendMode();
   m_propertyTrees.layer_id_to_effect_node_index[effectNode.owning_layer_id] =
       effectNode.id;
   CompositorElementId compositorElementId = nextEffect->compositorElementId();
   if (compositorElementId) {
     m_propertyTrees.element_id_to_effect_node_index[compositorElementId] =
         effectNode.id;
   }
   m_effectStack.push_back(BlinkEffectAndCcIdPair{nextEffect, effectNode.id});
 
-  dummyLayer->set_property_tree_sequence_number(kPropertyTreeSequenceNumber);
+  dummyLayer->set_property_tree_sequence_number(m_sequenceNumber);
   dummyLayer->SetTransformTreeIndex(kSecondaryRootNodeId);
   dummyLayer->SetClipTreeIndex(outputClipId);
   dummyLayer->SetEffectTreeIndex(effectNode.id);
   dummyLayer->SetScrollTreeIndex(kRealRootNodeId);
 }
 
 }  // namespace blink