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 17 matching lines @@
         contents_scale_y(1.f),
         num_descendants_that_draw_content(0),
         num_unclipped_descendants(0),
         layer_or_descendant_has_copy_request(false),
         has_child_with_a_scroll_parent(false),
         sorted_for_recursion(false),
         index_of_first_descendants_addition(0),
         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.
   gfx::Transform target_space_transform;
 
   // Transforms objects from content space to screen space (viewport space).
   gfx::Transform screen_space_transform;
 
   // DrawProperties::opacity may be different than LayerType::opacity,
   // particularly in the case when a RenderSurface re-parents the layer's
@@ skipping 72 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;
+
+  // 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
 
 #endif  // CC_LAYERS_DRAW_PROPERTIES_H_