cc: Move tiling management out of draw properties calculation.

cc/trees/layer_tree_host_common.cc

Index: cc/trees/layer_tree_host_common.cc
diff --git a/cc/trees/layer_tree_host_common.cc b/cc/trees/layer_tree_host_common.cc
index 2335f4e0315b29726af6279526ed3c26955ca29f..a4f8194b2ad5abbb05e8fe91036304d9de4ecb17 100644
--- a/cc/trees/layer_tree_host_common.cc
+++ b/cc/trees/layer_tree_host_common.cc
@@ -81,7 +81,7 @@ inline gfx::Rect CalculateVisibleRectWithCachedLayerRect(
   minimal_surface_rect.Intersect(layer_rect_in_target_space);
 
   if (minimal_surface_rect.IsEmpty())
-      return gfx::Rect();
+    return gfx::Rect();
 
   // Project the corners of the target surface rect into the layer space.
   // This bounding rectangle may be larger than it needs to be (being
@@ -1740,6 +1740,15 @@ static void CalculateDrawPropertiesInternal(
       combined_maximum_animation_contents_scale,
       animating_transform_to_screen);
 
+  layer_draw_properties.ideal_contents_scale = ideal_contents_scale;

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

Notice that CalculateContentsScale() in this file does its work on the layer,
it's mask and it's replica's mask, if they exist.

We need to set these 4 properties on those 3 layers instead of just on |layer|
here. Splitting this off into a helper method that we call for each of the 3
layers would be nice.

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

Done.

+  layer_draw_properties.maximum_animation_contents_scale =
+      combined_maximum_animation_contents_scale;
+  layer_draw_properties.page_scale_factor =
+      data_from_ancestor.in_subtree_of_page_scale_application_layer
+          ? globals.page_scale_factor
+          : 1.f;
+  layer_draw_properties.device_scale_factor = globals.device_scale_factor;
+
   // The draw_transform that gets computed below is effectively the layer's
   // draw_transform, unless the layer itself creates a render_surface. In that
   // case, the render_surface re-parents the transforms.