cc: Move tiling management out of draw properties calculation.

cc/layers/draw_properties.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_LAYERS_DRAW_PROPERTIES_H_
 #define CC_LAYERS_DRAW_PROPERTIES_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/transform.h"
@@ skipping 110 matching lines @@
   size_t num_render_surfaces_added;
 
   // Each time we generate a new render surface layer list, an ID is used to
   // identify it. |last_drawn_render_surface_layer_list_id| is set to the ID
   // that marked the render surface layer list generation which last updated
   // these draw properties and determined that this layer will draw itself.
   // If these draw properties are not a part of the render surface layer list,
   // 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;
+
+  // Content scales for the layer, used to set scales for tiling and raster.

[danakj, 2014/05/16 14:49:05]

how about

"The scale at which content for the layer should be rastered in order to be
perfectly crisp."

+  // Draw transform scales.
+  float ideal_contents_scale;

[danakj, 2014/05/16 14:49:05]

empty line between each one

+  // Max animation scale.

[danakj, 2014/05/16 14:49:05]

"The maximum scale during the layers current animation at which content should
be rastered at to be crisp."

+  float maximum_animation_contents_scale;
+  // Page scale factor.

[danakj, 2014/05/16 14:49:05]

"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;
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_DRAW_PROPERTIES_H_