cc: Move tiling management out of draw properties calculation.

cc/resources/picture_layer_tiling_set.cc

Index: cc/resources/picture_layer_tiling_set.cc
diff --git a/cc/resources/picture_layer_tiling_set.cc b/cc/resources/picture_layer_tiling_set.cc
index d292d83fab2a53d05ba39d7ca579e3db11c2c0cc..267ee08ef4818fc44b56dd47fc58e9f8293f358b 100644
--- a/cc/resources/picture_layer_tiling_set.cc
+++ b/cc/resources/picture_layer_tiling_set.cc
@@ -324,10 +324,17 @@ void PictureLayerTilingSet::UpdateTilePriorities(
   gfx::Rect visible_layer_rect = gfx::ScaleToEnclosingRect(
       visible_content_rect, 1.f / layer_contents_scale);
 
+  float max_layer_contents_scale = layer_contents_scale;
+  for (size_t i = 0; i < this->num_tilings(); ++i) {
+    const PictureLayerTiling* tiling = this->tiling_at(i);
+    max_layer_contents_scale =
+        std::max(max_layer_contents_scale, tiling->contents_scale());
+  }
+
   for (size_t i = 0; i < tilings_.size(); ++i) {
     tilings_[i]->UpdateTilePriorities(tree,
                                       visible_layer_rect,
-                                      layer_contents_scale,
+                                      max_layer_contents_scale,
                                       current_frame_time_in_seconds);
   }
 }