CC: Fix precision loss in scale reciprocal.

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 dba7b506d8766c8363a1faed2d3bc6e813d6f253..c328497c467282fa8630bb9503ec83d741dfb935 100644
--- a/cc/trees/layer_tree_host_common.cc
+++ b/cc/trees/layer_tree_host_common.cc
@@ -1169,7 +1169,7 @@ static void CalculateDrawPropertiesInternal(
   layer_draw_properties.target_space_transform = combined_transform;
   // M[draw] = M[parent] * LT * S[layer2content]
   layer_draw_properties.target_space_transform.Scale
-      (1.f / layer->contents_scale_x(), 1.f / layer->contents_scale_y());
+      (1.0 / layer->contents_scale_x(), 1.0 / layer->contents_scale_y());

[danakj, 2013/08/27 02:28:49]

The input to this function is a double (at the moment) so this seems fine to me.

(Also how did this function opening bracket get line wrapped?)

However, I think the right thing to do is round nearly-integer scales to
integers in the draw/screen space transforms.

 
   // The layer's screen_space_transform represents the transform between root
   // layer's "screen space" and local content space.