This is super flaky on many platforms.

Failure log:

[ RUN      ] PictureInPictureLazyBackgroundPageApiTest.PictureInPictureInBackgroundPage
[31344:31344:0828/081509.027518:WARNING:user_policy_manager_factory_chromeos.cc(208)] No policy loaded for known non-enterprise user
[31344:31344:0828/081509.257999:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[31344:31344:0828/081509.258022:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[31344:31344:0828/081509.258029:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[31344:31344:0828/081509.258124:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[31344:31344:0828/081509.258132:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[31344:31344:0828/081509.258139:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[31344:31344:0828/081509.258173:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[31344:31344:0828/081509.258180:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[31344:31344:0828/081509.258186:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[31344:31344:0828/081509.258251:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[31344:31344:0828/081509.258257:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[31344:31344:0828/081509.258271:ERROR:network_type_pattern.cc(134)] NetworkTypePattern: wifi: Can not match empty type.
[31344:31344:0828/081509.317841:ERROR:content_gpu_interface_provider.cc(83)] Not implemented reached in virtual void ash::ContentGpuInterfaceProvider::RegisterOzoneGpuInterfaces(service_manager::BinderRegistry *)
[31344:31474:0828/081513.755770:WARNING:simple_synchronous_entry.cc(1252)] Could not open platform files for entry.
ALSA lib confmisc.c:768:(parse_card) cannot find card '0'
ALSA lib conf.c:4248:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory
ALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings
ALSA lib conf.c:4248:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory
ALSA lib confmisc.c:1251:(snd_func_refer) error evaluating name
ALSA lib conf.c:4248:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:4727:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM default
[31344:31482:0828/081513.794872:WARNING:alsa_util.cc(24)] PcmOpen: default,No such file or directory
ALSA lib confmisc.c:768:(parse_card) cannot find card '0'
ALSA lib conf.c:4248:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory
ALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings
ALSA lib conf.c:4248:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory
ALSA lib confmisc.c:1251:(snd_func_refer) error evaluating name
ALSA lib conf.c:4248:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:4727:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM default
[31344:31482:0828/081513.794968:WARNING:alsa_util.cc(24)] PcmOpen: plug:default,No such file or directory
[31344:31482:0828/081513.795003:ERROR:audio_output_resampler.cc(385)] Unable to open audio device in high latency mode.  Falling back to fake audio output.
../../chrome/browser/extensions/lazy_background_page_apitest.cc:670: Failure
Expected equality of these values:
  pm->GetLazyKeepaliveCount(extension)
    Which is: 1
  previous_keep_alive_count + 1
    Which is: 2
Stack trace:
#0 0x000002490a3c testing::internal::UnitTestImpl::CurrentOsStackTraceExceptTop()
#1 0x000002490419 testing::internal::AssertHelper::operator=()
#2 0x0000016d87e0 extensions::PictureInPictureLazyBackgroundPageApiTest_PictureInPictureInBackgroundPage_Test::RunTestOnMainThread()
#3 0x0000053134a2 content::BrowserTestBase::ProxyRunTestOnMainThreadLoop()
#4 0x000004de892b ChromeBrowserMainParts::PreMainMessageLoopRunImpl()
#5 0x000004de771a ChromeBrowserMainParts::PreMainMessageLoopRun()
#6 0x000001fb7078 chromeos::ChromeBrowserMainPartsChromeos::PreMainMessageLoopRun()
#7 0x0000032d2931 content::BrowserMainLoop::PreMainMessageLoopRun()
#8 0x000003770635 content::StartupTaskRunner::RunAllTasksNow()
#9 0x0000032d1068 content::BrowserMainLoop::CreateStartupTasks()
#10 0x0000032d5193 content::BrowserMainRunnerImpl::Initialize()
#11 0x0000032cebe2 content::BrowserMain()
#12 0x000004bd11da content::ContentMainRunnerImpl::Run()
#13 0x000006f5fe75 service_manager::Main()
#14 0x000004bcf674 content::ContentMain()
#15 0x00000531306c content::BrowserTestBase::SetUp()
#16 0x000004d89f7b InProcessBrowserTest::SetUp()
[31344:31344:0828/081517.986186:ERROR:media_internals.cc(104)] Cannot get RenderProcessHost
[31344:31460:0828/081518.122954:WARNING:discardable_shared_memory_manager.cc(438)] Some MojoDiscardableSharedMemoryManagerImpls are still alive. They will be leaked.
[31344:31344:0828/081518.125334:WARNING:pref_notifier_impl.cc(23)] Pref observer found at shutdown.
[31344:31344:0828/081518.125359:WARNING:pref_notifier_impl.cc(23)] Pref observer found at shutdown.
[31344:1172:0828/081518.126016:WARNING:internal_linux.cc(64)] Failed to read /proc/31489/stat
[31344:31344:0828/081518.127035:WARNING:url_request_context_getter.cc(43)] URLRequestContextGetter leaking due to no owning thread.
[31344:31344:0828/081518.127050:WARNING:url_request_context_getter.cc(43)] URLRequestContextGetter leaking due to no owning thread.
[  FAILED  ] PictureInPictureLazyBackgroundPageApiTest.PictureInPictureInBackgroundPage, where TypeParam =  and GetParam() =  (9539 ms)

This test is already disabled, and this issue is already tracked at  bug 878396 .