Use preferred format to allocate memory for decoded images

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 5e21974d5802a02a71f1ebf7b93e3040112d56d3..dd7bd235b3cfca87ec67661c03bef8ed14c76d0c 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -2145,7 +2145,8 @@ void LayerTreeHostImpl::CreateTileManagerResources() {
     image_decode_controller_ = make_scoped_ptr(new GpuImageDecodeController);
   } else {
     image_decode_controller_ =
-        make_scoped_ptr(new SoftwareImageDecodeController);
+        make_scoped_ptr(new SoftwareImageDecodeController(
+            settings_.renderer_settings.preferred_tile_format));
   }
 
   // TODO(vmpstr): Initialize tile task limit at ctor time.