[Ozone] Fix setting the transform on the AshWindowTreeHost

BUG=398888
NOTRY=true

Review URL: https://codereview.chromium.org/443713002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287720 0039d316-1c4b-4281-b951-d872f2087c98

ash/host/ash_window_tree_host_ozone.cc

@@ -72,7 +72,7 @@ aura::WindowTreeHost* AshWindowTreeHostOzone::AsWindowTreeHost() {
 }
 
 void AshWindowTreeHostOzone::SetRootTransform(const gfx::Transform& transform) {
-  transformer_helper_.GetTransform();
+  transformer_helper_.SetTransform(transform);
 }
 
 gfx::Transform AshWindowTreeHostOzone::GetRootTransform() const {