Add context to gfx::Screen calls in support of simultaneous desktop+ash

ui/views/examples/content_client/examples_browser_main_parts.cc

Index: ui/views/examples/content_client/examples_browser_main_parts.cc
diff --git a/ui/views/examples/content_client/examples_browser_main_parts.cc b/ui/views/examples/content_client/examples_browser_main_parts.cc
index a21c9c162efc7a84f019689c83c77ef2841e4b70..3c0b2603daf803cfbec5c05b44c13da0957f6025 100644
--- a/ui/views/examples/content_client/examples_browser_main_parts.cc
+++ b/ui/views/examples/content_client/examples_browser_main_parts.cc
@@ -58,7 +58,8 @@ void ExamplesBrowserMainParts::PreMainMessageLoopRun() {
 #if defined(USE_AURA)
   aura::Env::GetInstance()->SetDisplayManager(new aura::SingleDisplayManager);
   stacking_client_.reset(new aura::DesktopStackingClient);
-  gfx::Screen::SetInstance(aura::CreateDesktopScreen());
+  gfx::Screen::SetScreenInstance(
+      gfx::SCREEN_TYPE_NATIVE, aura::CreateDesktopScreen());
 #endif
   views_delegate_.reset(new ExamplesViewsDelegate);