Consider occluded tiles during eviction with occluded as Tile property.

cc/resources/tile.h

Index: cc/resources/tile.h
diff --git a/cc/resources/tile.h b/cc/resources/tile.h
index 716ea99024703a4e4e8b0363d8d427201770ff6a..93e704b48182a33470befcef7602f8d0bfcbdb1c 100644
--- a/cc/resources/tile.h
+++ b/cc/resources/tile.h
@@ -60,6 +60,25 @@ class CC_EXPORT Tile : public RefCountedManaged<Tile> {
 
   void SetPriority(WhichTree tree, const TilePriority& priority);
 
+  void set_is_occluded(WhichTree tree, bool is_occluded) {
+    is_occluded_[tree] = is_occluded;
+  }
+
+  bool is_occluded(WhichTree tree) const { return is_occluded_[tree]; }
+
+  bool is_occluded_for_tree_priority(TreePriority tree_priority) const {
+    switch (tree_priority) {
+      case SMOOTHNESS_TAKES_PRIORITY:
+        return is_occluded_[ACTIVE_TREE];
+      case NEW_CONTENT_TAKES_PRIORITY:
+        return is_occluded_[PENDING_TREE];
+      case SAME_PRIORITY_FOR_BOTH_TREES:
+        return is_occluded_[ACTIVE_TREE] && is_occluded_[PENDING_TREE];
+    }
+    NOTREACHED();
+    return false;
+  }
+
   void MarkRequiredForActivation();
 
   bool required_for_activation() const {
@@ -128,12 +147,6 @@ class CC_EXPORT Tile : public RefCountedManaged<Tile> {
     return managed_state_.tile_versions[mode];
   }
 
-  void set_is_occluded(WhichTree tree, bool is_occluded) {
-    is_occluded_[tree] = is_occluded;
-  }
-
-  bool is_occluded(WhichTree tree) const { return is_occluded_[tree]; }
-
  private:
   friend class TileManager;
   friend class PrioritizedTileSet;