Add kApplicationIdKey for ShellSurface::GetApplicationId and SetApplicationId

components/exo/shell_surface_unittest.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 "components/exo/shell_surface.h"
 
 #include "ash/accessibility_delegate.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/public/cpp/window_properties.h"
 #include "ash/public/interfaces/window_pin_type.mojom.h"
@@ skipping 232 matching lines @@
       new Buffer(exo_test_helper()->CreateGpuMemoryBuffer(buffer_size)));
   std::unique_ptr<Surface> surface(new Surface);
   std::unique_ptr<ShellSurface> shell_surface(new ShellSurface(surface.get()));
 
   EXPECT_EQ(nullptr, shell_surface->GetWidget());
   shell_surface->SetApplicationId("pre-widget-id");
 
   surface->Attach(buffer.get());
   surface->Commit();
   aura::Window* window = shell_surface->GetWidget()->GetNativeWindow();
-  EXPECT_EQ("pre-widget-id", ShellSurface::GetApplicationId(window));
+  EXPECT_EQ("pre-widget-id", *ShellSurface::GetApplicationId(window));
   shell_surface->SetApplicationId("test");
-  EXPECT_EQ("test", ShellSurface::GetApplicationId(window));
+  EXPECT_EQ("test", *ShellSurface::GetApplicationId(window));
 }
 
 TEST_F(ShellSurfaceTest, Move) {
   std::unique_ptr<Surface> surface(new Surface);
   std::unique_ptr<ShellSurface> shell_surface(new ShellSurface(surface.get()));
 
   // Map shell surface.
   surface->Commit();
 
   // The interactive move should end when surface is destroyed.
@@ skipping 707 matching lines @@
             shell_surface->surface_for_testing()->window()->bounds().size());
 
   ash::wm::WMEvent minimize_event(ash::wm::WM_EVENT_MINIMIZE);
   ash::WmWindow* window =
       ash::WmWindow::Get(shell_surface->GetWidget()->GetNativeWindow());
   window->GetWindowState()->OnWMEvent(&minimize_event);
 }
 
 }  // namespace
 }  // namespace exo