[wip/exp] cc: Measure the amount of overdraw.

ash/system/tray/system_tray_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/system/tray/system_tray.h"
 
 #include <string>
 #include <vector>
 
 #include "ash/accelerators/accelerator_controller.h"
 #include "ash/accessibility_delegate.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/root_window_controller.h"
 #include "ash/shelf/shelf.h"
 #include "ash/shell.h"
 #include "ash/system/status_area_widget.h"
 #include "ash/system/tray/system_tray_bubble.h"
 #include "ash/system/tray/system_tray_item.h"
 #include "ash/system/tray/tray_constants.h"
 #include "ash/system/web_notification/web_notification_tray.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/test/status_area_widget_test_helper.h"
 #include "ash/test/test_system_tray_item.h"
 #include "ash/wm/window_util.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/test/histogram_tester.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/compositor/scoped_animation_duration_scale_mode.h"
+#include "ui/compositor/test/draw_waiter_for_test.h"
 #include "ui/events/test/event_generator.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/views/controls/separator.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_delegate.h"
 
 namespace ash {
 namespace test {
@@ skipping 259 matching lines @@
   tray->ShowDefaultView(BUBBLE_CREATE_NEW);
   ASSERT_TRUE(tray->is_active());
 
   // Changing the alignment should close the system bubble and change the
   // background color.
   shelf->SetAlignment(SHELF_ALIGNMENT_LEFT);
   ASSERT_FALSE(tray->is_active());
   RunAllPendingInMessageLoop();
   // The bubble should already be closed by now.
   ASSERT_FALSE(tray->CloseSystemBubble());
+
+  ui::DrawWaiterForTest::WaitForCommit(tray->GetWidget()->GetCompositor());
 }
 
 TEST_F(SystemTrayTest, SystemTrayTestItems) {
   SystemTray* tray = GetPrimarySystemTray();
   ASSERT_TRUE(tray->GetWidget());
 
   TestSystemTrayItem* test_item = new TestSystemTrayItem();
   TestSystemTrayItem* detailed_item = new TestSystemTrayItem();
   tray->AddTrayItem(base::WrapUnique(test_item));
   tray->AddTrayItem(base::WrapUnique(detailed_item));
@@ skipping 267 matching lines @@
 
   EXPECT_EQ(0, notification_tray->tray_bubble_height_for_test());
 }
 
 TEST_F(SystemTrayTest, SeparatorThickness) {
   EXPECT_EQ(kSeparatorWidth, views::Separator::kThickness);
 }
 
 }  // namespace test
 }  // namespace ash