mus: Don't activate non-activatable widgets on Show()

ui/views/mus/native_widget_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/native_widget_mus.h"
 
 #include "base/macros.h"
 #include "base/thread_task_runner_handle.h"
 #include "components/mus/public/cpp/property_type_converters.h"
 #include "components/mus/public/cpp/window.h"
@@ skipping 691 matching lines @@
     const gfx::Rect& restored_bounds) {
   // NOTIMPLEMENTED();
 }
 
 void NativeWidgetMus::ShowWithWindowState(ui::WindowShowState state) {
   if (!window_tree_host_)
     return;
 
   window_tree_host_->Show();
   GetNativeWindow()->Show();
-  if (state != ui::SHOW_STATE_INACTIVE)
-    Activate();
-  GetWidget()->SetInitialFocus(state);
+  if (native_widget_delegate_->CanActivate()) {
+    if (state != ui::SHOW_STATE_INACTIVE)
+      Activate();
+    GetWidget()->SetInitialFocus(state);
+  }
 }
 
 bool NativeWidgetMus::IsVisible() const {
   // TODO(beng): this should probably be wired thru PlatformWindow.
   return window_ && window_->visible();
 }
 
 void NativeWidgetMus::Activate() {
   if (window_tree_host_)
     window_tree_host_->platform_window()->Activate();
@@ skipping 320 matching lines @@
     window_tree_host_->Show();
     GetNativeWindow()->Show();
   } else {
     window_tree_host_->Hide();
     GetNativeWindow()->Hide();
   }
   native_widget_delegate_->OnNativeWidgetVisibilityChanged(window->visible());
 }
 
 }  // namespace views