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 0091ee5bb148f176610ff2126ba23bcba24d2d19..b22de54fd21c0bf080023b2e712a8fbf3d812e18 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.