mash: Use null AcceleratedWidget for widgets in tests

ash/common/wm/workspace/workspace_layout_manager_unittest.cc

 // Copyright (c) 2012 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 "ash/common/wm/workspace/workspace_layout_manager.h"
 
 #include <string>
 #include <utility>
 
 #include "ash/common/session/session_state_delegate.h"
@@ skipping 916 matching lines @@
   WmWindow* default_container_;
 
   DISALLOW_COPY_AND_ASSIGN(WorkspaceLayoutManagerBackdropTest);
 };
 
 }  // namespace
 
 // Check that creating the BackDrop without destroying it does not lead into
 // a crash.
 TEST_F(WorkspaceLayoutManagerBackdropTest, BackdropCrashTest) {
-  // TODO: Triggers crash in mash: http://crbug.com/652871.
-  if (WmShell::Get()->IsRunningInMash())
-    return;
-
   ShowTopWindowBackdrop(true);
 }
 
 // Verify basic assumptions about the backdrop.
 TEST_F(WorkspaceLayoutManagerBackdropTest, BasicBackdropTests) {
-  // TODO: Triggers crash in mash: http://crbug.com/652871.
-  if (WmShell::Get()->IsRunningInMash())
-    return;
-
   // Create a backdrop and see that there is one window (the backdrop) and
   // that the size is the same as the default container as well as that it is
   // not visible.
   ShowTopWindowBackdrop(true);
   ASSERT_EQ(1U, default_container()->GetChildren().size());
   EXPECT_FALSE(default_container()->GetChildren()[0]->IsVisible());
 
   {
     // Add a window and make sure that the backdrop is the second child.
     std::unique_ptr<WindowOwner> window_owner(
@@ skipping 12 matching lines @@
   ASSERT_EQ(1U, default_container()->GetChildren().size());
   EXPECT_FALSE(default_container()->GetChildren()[0]->IsVisible());
 
   // Destroying the Backdrop should empty the container.
   ShowTopWindowBackdrop(false);
   ASSERT_EQ(0U, default_container()->GetChildren().size());
 }
 
 // Verify that the backdrop gets properly created and placed.
 TEST_F(WorkspaceLayoutManagerBackdropTest, VerifyBackdropAndItsStacking) {
-  // TODO: Triggers crash in mash: http://crbug.com/652871.
-  if (WmShell::Get()->IsRunningInMash())
-    return;
-
   std::unique_ptr<WindowOwner> window1_owner(
       CreateTestWindow(gfx::Rect(1, 2, 3, 4)));
   WmWindow* window1 = window1_owner->window();
   window1->Show();
 
   // Get the default container and check that only a single window is in there.
   ASSERT_EQ(1U, default_container()->GetChildren().size());
   EXPECT_EQ(window1, default_container()->GetChildren()[0]);
   EXPECT_EQ("A", GetWindowOrderAsString(nullptr, window1, nullptr, nullptr));
 
@@ skipping 34 matching lines @@
             GetWindowOrderAsString(backdrop, window1, window2, window3));
   window3_owner.reset();
   EXPECT_EQ("b,x", GetWindowOrderAsString(backdrop, window1, window2, window3));
   ShowTopWindowBackdrop(false);
   EXPECT_EQ("b", GetWindowOrderAsString(nullptr, window1, window2, window3));
 }
 
 // Tests that when hidding the shelf, that the backdrop resizes to fill the
 // entire workspace area.
 TEST_F(WorkspaceLayoutManagerBackdropTest, ShelfVisibilityChangesBounds) {
-  // TODO: Triggers crash in mash: http://crbug.com/652871.
-  if (WmShell::Get()->IsRunningInMash())
-    return;
-
   WmShelf* shelf = GetPrimaryShelf();
   ShelfLayoutManager* shelf_layout_manager = shelf->shelf_layout_manager();
   ShowTopWindowBackdrop(true);
   RunAllPendingInMessageLoop();
 
   ASSERT_EQ(SHELF_VISIBLE, shelf_layout_manager->visibility_state());
   gfx::Rect initial_bounds = default_container()->GetChildren()[0]->GetBounds();
   shelf->SetAutoHideBehavior(SHELF_AUTO_HIDE_ALWAYS_HIDDEN);
   shelf_layout_manager->UpdateVisibilityState();
 
@@ skipping 155 matching lines @@
   WmWindow* window = window_owner->window();
   window->GetWindowState()->set_ignore_keyboard_bounds_change(true);
   window->Activate();
 
   EXPECT_EQ(keyboard_bounds(), window->GetBounds());
   ShowKeyboard();
   EXPECT_EQ(keyboard_bounds(), window->GetBounds());
 }
 
 }  // namespace ash