Added Ash.SystemMenu.DefaultView.VisibleItems histogram.

ash/common/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/common/system/tray/system_tray.h"
 
 #include <vector>
 
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/shelf/wm_shelf.h"
@@ skipping 28 matching lines @@
 
 namespace ash {
 namespace test {
 
 namespace {
 
 // Trivial item implementation that tracks its views for testing.
 class TestItem : public SystemTrayItem {
  public:
   TestItem()
-      : SystemTrayItem(AshTestBase::GetPrimarySystemTray()),
+      : SystemTrayItem(AshTestBase::GetPrimarySystemTray(), NETWORK),
         tray_view_(nullptr),
         default_view_(nullptr),
         detailed_view_(nullptr),
         notification_view_(nullptr) {}
 
   views::View* CreateTrayView(LoginStatus status) override {
     tray_view_ = new views::View;
     // Add a label so it has non-zero width.
     tray_view_->SetLayoutManager(new views::FillLayout);
     tray_view_->AddChildView(new views::Label(base::UTF8ToUTF16("Tray")));
@@ skipping 39 matching lines @@
   views::View* tray_view_;
   views::View* default_view_;
   views::View* detailed_view_;
   views::View* notification_view_;
 };
 
 // Trivial item implementation that returns NULL from tray/default/detailed
 // view creation methods.
 class TestNoViewItem : public SystemTrayItem {
  public:
-  TestNoViewItem() : SystemTrayItem(AshTestBase::GetPrimarySystemTray()) {}
+  TestNoViewItem()
+      : SystemTrayItem(AshTestBase::GetPrimarySystemTray(), NETWORK) {}
 
   views::View* CreateTrayView(LoginStatus status) override { return nullptr; }
 
   views::View* CreateDefaultView(LoginStatus status) override {
     return nullptr;
   }
 
   views::View* CreateDetailedView(LoginStatus status) override {
     return nullptr;
   }
@@ skipping 426 matching lines @@
   // Hide the default view, ensure the tray bubble height is back to zero.
   ASSERT_TRUE(tray->CloseSystemBubble());
   RunAllPendingInMessageLoop();
 
   EXPECT_EQ(0, notification_tray->tray_bubble_height_for_test());
 }
 #endif  // OS_CHROMEOS
 
 }  // namespace test
 }  // namespace ash