cc: Move tiling management out of draw properties calculation.

cc/layers/draw_properties.h

Index: cc/layers/draw_properties.h
diff --git a/cc/layers/draw_properties.h b/cc/layers/draw_properties.h
index 3f167b9b0b653c219f001f4072d149e700e0accc..d9189e991fd114ea797c27c23ad4db181c68e70c 100644
--- a/cc/layers/draw_properties.h
+++ b/cc/layers/draw_properties.h
@@ -128,6 +128,21 @@ struct CC_EXPORT DrawProperties {
   // or the layer doesn't contribute anything, then this ID will be either out
   // of date or 0.
   int last_drawn_render_surface_layer_list_id;
+
+  // The scale at which content for the layer should be rastered in order to be
+  // perfectly crisp.
+  float ideal_contents_scale;
+
+  // The maximum scale during the layers current animation at which content
+  // should be rastered at to be crisp.
+  float maximum_animation_contents_scale;
+
+  // The page scale factor that is applied to the layer. Since some layers may
+  // have page scale applied and others not, this may differ between layers.
+  float page_scale;

[danakj, 2014/05/21 15:01:00]

nit: add _factor to this and below as that's what we call it everywhere else

+
+  // The device scale factor that is applied to the layer.
+  float device_scale;
 };
 
 }  // namespace cc