Makes WindowTreeHost::InitHost() not Show the window

headless/lib/browser/headless_browser_impl.cc

Index: headless/lib/browser/headless_browser_impl.cc
diff --git a/headless/lib/browser/headless_browser_impl.cc b/headless/lib/browser/headless_browser_impl.cc
index aad7e85f497a66e92cb19638d77ba7c8888413b9..876be95cdc802db462bc1876df03d2d11e8597b5 100644
--- a/headless/lib/browser/headless_browser_impl.cc
+++ b/headless/lib/browser/headless_browser_impl.cc
@@ -22,6 +22,7 @@
 #include "headless/lib/browser/headless_window_tree_host.h"
 #include "headless/lib/headless_content_main_delegate.h"
 #include "ui/aura/env.h"
+#include "ui/aura/window.h"
 #include "ui/events/devices/device_data_manager.h"
 #include "ui/gfx/geometry/size.h"
 
@@ -125,6 +126,7 @@ void HeadlessBrowserImpl::RunOnStartCallback() {
   window_tree_host_.reset(
       new HeadlessWindowTreeHost(gfx::Rect(options()->window_size)));
   window_tree_host_->InitHost();
+  window_tree_host_->window()->Show();
 
   window_parenting_client_.reset(
       new HeadlessWindowParentingClient(window_tree_host_->window()));