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..dc7c0a156d64c26c1d28d3f82f87f86228327db2 100644
--- a/cc/layers/draw_properties.h
+++ b/cc/layers/draw_properties.h
@@ -35,7 +35,11 @@ struct CC_EXPORT DrawProperties {
         num_descendants_added(0),
         index_of_first_render_surface_layer_list_addition(0),
         num_render_surfaces_added(0),
-        last_drawn_render_surface_layer_list_id(0) {}
+        last_drawn_render_surface_layer_list_id(0),
+        ideal_contents_scale(1.f),

[danakj, 2014/06/11 19:48:35]

can you init these all to 0, so we don't hide this problem in the future should
we do this again.

[sohanjg, 2014/06/12 11:48:24]

Done.

+        maximum_animation_contents_scale(1.f),
+        page_scale_factor(1.f),
+        device_scale_factor(1.f) {}
 
   // Transforms objects from content space to target surface space, where
   // this layer would be drawn.
@@ -128,6 +132,21 @@ 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_factor;
+
+  // The device scale factor that is applied to the layer.
+  float device_scale_factor;
 };
 
 }  // namespace cc