cc: Separate the priority from the tile and put in new PrioritizedTile

cc/resources/tile.cc

Index: cc/resources/tile.cc
diff --git a/cc/resources/tile.cc b/cc/resources/tile.cc
index 94e42ec11e1a68ccd4cb59d8dabb4a71a0623c9b..2faa6e48b2e4c2c4d4be306394b1c89170dcd1d7 100644
--- a/cc/resources/tile.cc
+++ b/cc/resources/tile.cc
@@ -56,16 +56,6 @@ void Tile::AsValueWithPriorityInto(const TilePriority& priority,
 
   res->SetInteger("layer_id", layer_id_);
 
-  // TODO(vmpstr): Remove active and pending priority once tracing is using
-  // combined priority or at least can support both.
-  res->BeginDictionary("active_priority");
-  priority_.AsValueInto(res);
-  res->EndDictionary();
-
-  res->BeginDictionary("pending_priority");
-  priority_.AsValueInto(res);
-  res->EndDictionary();
-
   res->BeginDictionary("combined_priority");
   priority.AsValueInto(res);
   res->EndDictionary();
@@ -76,7 +66,7 @@ void Tile::AsValueWithPriorityInto(const TilePriority& priority,
 
   res->SetBoolean("has_resource", HasResource());
   res->SetBoolean("is_using_gpu_memory", HasResource() || HasRasterTask());
-  res->SetString("resolution", TileResolutionToString(priority_.resolution));
+  res->SetString("resolution", TileResolutionToString(priority.resolution));
 
   res->SetInteger("scheduled_priority", scheduled_priority_);