mash: Use null AcceleratedWidget for widgets in tests

ui/views/mus/window_tree_host_mus.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/mus/window_tree_host_mus.h"
 
 #include "base/memory/ptr_util.h"
 #include "services/ui/public/cpp/window.h"
+#include "ui/aura/env.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/events/event.h"
 #include "ui/platform_window/stub/stub_window.h"
 #include "ui/views/mus/input_method_mus.h"
 #include "ui/views/mus/native_widget_mus.h"
 
 namespace views {
 
 namespace {
 static uint32_t accelerated_widget_count = 1;
+
+bool IsUsingTestContext() {
+  return aura::Env::GetInstance()->context_factory()->DoesCreateTestContexts();
+}
+
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // WindowTreeHostMus, public:
 
 WindowTreeHostMus::WindowTreeHostMus(NativeWidgetMus* native_widget,
                                      ui::Window* window)
     : native_widget_(native_widget) {
-// We need accelerated widget numbers to be different for each
-// window and fit in the smallest sizeof(AcceleratedWidget) uint32_t
-// has this property.
+  gfx::AcceleratedWidget accelerated_widget;
+  if (IsUsingTestContext()) {
+    accelerated_widget = gfx::kNullAcceleratedWidget;
+  } else {
+    // We need accelerated widget numbers to be different for each
+    // window and fit in the smallest sizeof(AcceleratedWidget) uint32_t
+    // has this property.
 #if defined(OS_WIN) || defined(OS_ANDROID)
-  gfx::AcceleratedWidget accelerated_widget =
-      reinterpret_cast<gfx::AcceleratedWidget>(accelerated_widget_count++);
+    accelerated_widget =
+        reinterpret_cast<gfx::AcceleratedWidget>(accelerated_widget_count++);
 #else
-  gfx::AcceleratedWidget accelerated_widget =
-      static_cast<gfx::AcceleratedWidget>(accelerated_widget_count++);
+    accelerated_widget =
+        static_cast<gfx::AcceleratedWidget>(accelerated_widget_count++);
 #endif
+  }
   // TODO(markdittmer): Use correct device-scale-factor from |window|.
   OnAcceleratedWidgetAvailable(accelerated_widget, 1.f);
 
   SetPlatformWindow(base::MakeUnique<ui::StubWindow>(
       this,
       false));  // Do not advertise accelerated widget; already set manually.
 
   compositor()->SetWindow(window);
 
   // Initialize the stub platform window bounds to those of the ui::Window.
@@ skipping 45 matching lines @@
 void WindowTreeHostMus::OnCloseRequest() {
   OnHostCloseRequested();
 }
 
 gfx::ICCProfile WindowTreeHostMus::GetICCProfileForCurrentDisplay() {
   // TODO: This should read the profile from mus. crbug.com/647510
   return gfx::ICCProfile();
 }
 
 }  // namespace views