mus: Show USER_PRIVATE window container during views tests

ui/views/mus/platform_test_helper_mus.cc

 // Copyright 2016 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 "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
+#include "components/mus/common/switches.h"
 #include "services/shell/background/background_shell.h"
 #include "services/shell/background/tests/test_catalog_store.h"
 #include "services/shell/public/cpp/connector.h"
 #include "services/shell/public/cpp/shell_client.h"
 #include "services/shell/public/cpp/shell_connection.h"
 #include "ui/aura/env.h"
 #include "ui/views/mus/window_manager_connection.h"
 #include "ui/views/test/platform_test_helper.h"
 #include "ui/views/views_delegate.h"
 
 using shell::BackgroundShell;
 
 namespace views {
 namespace {
 
+void EnsureCommandLineSwitch(const std::string& name) {
+  base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
+  if (!cmd_line->HasSwitch(name))
+    cmd_line->AppendSwitch(name);
+}
+
 class DefaultShellClient : public shell::ShellClient {
  public:
   DefaultShellClient() {}
   ~DefaultShellClient() override {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DefaultShellClient);
 };
 
 class PlatformTestHelperMus : public PlatformTestHelper {
  public:
   PlatformTestHelperMus() {
+    // Let other mojo apps know that we're running in tests. Do this with a
+    // command line flag to avoid making blocking calls to other processes for
+    // setup for tests (e.g. to unlock the screen in the window manager).
+    EnsureCommandLineSwitch(mus::switches::kUseTestConfig);
+
     background_shell_.reset(new BackgroundShell);
     background_shell_->Init(nullptr);
     shell_client_.reset(new DefaultShellClient);
     shell_connection_.reset(new shell::ShellConnection(
         shell_client_.get(),
         background_shell_->CreateShellClientRequest(GetTestName())));
 
     // TODO(rockot): Remove this RunLoop. http://crbug.com/594852.
     base::RunLoop wait_loop;
     shell_connection_->set_initialize_handler(wait_loop.QuitClosure());
@@ skipping 55 matching lines @@
 std::unique_ptr<PlatformTestHelper> PlatformTestHelper::Create() {
   return base::WrapUnique(new PlatformTestHelperMus);
 }
 
 // static
 bool PlatformTestHelper::IsMus() {
   return true;
 }
 
 }  // namespace views