When we switch tabs in chrome, the tab being switched away from gets hidden/shown/hidden.

chrome/chrome_tests_unit.gypi

 # Copyright 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.
 {
   'targets': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 2115 matching lines @@
               'sources!': [
                 'browser/ui/window_sizer/window_sizer_unittest.cc',
               ],
             }],
           ],
         }],
         ['use_aura==1', {
           'dependencies': [
             '../ui/wm/wm.gyp:wm',
             '../ui/aura/aura.gyp:aura_test_support',
+            '../ui/views/views.gyp:views_test_support',
           ],
           'sources/': [
             ['exclude', '^browser/ui/views/extensions/browser_action_drag_data_unittest.cc'],
           ],
+          'sources': [
+            '../ui/views/controls/webview/webview_unittest.cc',
+          ],
         }],
         ['use_aura==1 and use_ash==0 and use_ozone==0 and OS=="linux"', {
           'dependencies': [
             'browser/ui/libgtk2ui/libgtk2ui.gyp:gtk2ui',
             '../build/linux/system.gyp:gio',
           ],
         }, {
           'sources/': [
             ['exclude', '^browser/ui/libgtk2ui/'],
           ],
@@ skipping 728 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }