Fullscreen backdrop window for maximize mode

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_controller.h"
@@ skipping 1080 matching lines @@
   // Then delete window after window and see that everything is in order.
   window1_owner.reset();
   EXPECT_EQ("b,C,X",
             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) {
+// Tests that when hidding the shelf, that the backdrop stays fullscreen.
+TEST_F(WorkspaceLayoutManagerBackdropTest,
+       ShelfVisibilityDoesNotChangesBounds) {
   WmShelf* shelf = GetPrimaryShelf();
   ShelfLayoutManager* shelf_layout_manager = shelf->shelf_layout_manager();
   ShowTopWindowBackdrop(true);
   RunAllPendingInMessageLoop();
+  const gfx::Size fullscreen_size =
+      display::Screen::GetScreen()->GetPrimaryDisplay().size();
 
   ASSERT_EQ(SHELF_VISIBLE, shelf_layout_manager->visibility_state());
-  gfx::Rect initial_bounds = default_container()->GetChildren()[0]->GetBounds();
+  EXPECT_EQ(fullscreen_size,
+            default_container()->GetChildren()[0]->GetBounds().size());
   shelf->SetAutoHideBehavior(SHELF_AUTO_HIDE_ALWAYS_HIDDEN);
   shelf_layout_manager->UpdateVisibilityState();
 
-  // When the shelf is re-shown WorkspaceLayoutManager shrinks all children
-  // including the backdrop.
+  // When the shelf is re-shown WorkspaceLayoutManager shrinks all children but
+  // the backdrop.
   shelf->SetAutoHideBehavior(SHELF_AUTO_HIDE_BEHAVIOR_NEVER);
   shelf_layout_manager->UpdateVisibilityState();
-  gfx::Rect reduced_bounds = default_container()->GetChildren()[0]->GetBounds();
-  EXPECT_LT(reduced_bounds.height(), initial_bounds.height());
+  EXPECT_EQ(fullscreen_size,
+            default_container()->GetChildren()[0]->GetBounds().size());
 
   shelf->SetAutoHideBehavior(SHELF_AUTO_HIDE_ALWAYS_HIDDEN);
   shelf_layout_manager->UpdateVisibilityState();
-
-  EXPECT_GT(default_container()->GetChildren()[0]->GetBounds().height(),
-            reduced_bounds.height());
+  EXPECT_EQ(fullscreen_size,
+            default_container()->GetChildren()[0]->GetBounds().size());
 }
 
 class WorkspaceLayoutManagerKeyboardTest : public AshTest {
  public:
   WorkspaceLayoutManagerKeyboardTest() : layout_manager_(nullptr) {}
   ~WorkspaceLayoutManagerKeyboardTest() override {}
 
   void SetUp() override {
     AshTest::SetUp();
     UpdateDisplay("800x600");
@@ skipping 139 matching lines @@
   window->SetBounds(keyboard_bounds());
   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