See
https://uberchromegw.corp.google.com/i/chromium.memory/builders/Mac%20ASan%2064%20Tests%20%281%29/builds/25560
https://uberchromegw.corp.google.com/i/chromium.memory/builders/Mac%20ASan%2064%20Tests%20%281%29/builds/25559
https://uberchromegw.corp.google.com/i/chromium.memory/builders/Mac%20ASan%2064%20Tests%20%281%29/builds/25549

This might be related to  issue 674497 

Sample logs:
TabCaptureApiTest.MaxOffscreenTabs (run #1):
[ RUN      ] TabCaptureApiTest.MaxOffscreenTabs
[19032:52739:1215/051125.679342:WARNING:mac_util.mm(222)] Failed to set backup exclusion for file '/private/var/folders/9x/6c6sv3cj4j53wzpzthbp4ksm0000gm/T/.org.chromium.Chromium.rigpyq/dHD8kkR/Default/History': Error Domain=NSOSStatusErrorDomain Code=-50 "The operation couldn?t be completed. (OSStatus error -50.)" (paramErr: error in user parameter list) (-50)
[19032:52739:1215/051125.925360:WARNING:mac_util.mm(222)] Failed to set backup exclusion for file '/private/var/folders/9x/6c6sv3cj4j53wzpzthbp4ksm0000gm/T/.org.chromium.Chromium.rigpyq/dHD8kkR/Default/Favicons': Error Domain=NSOSStatusErrorDomain Code=-50 "The operation couldn?t be completed. (OSStatus error -50.)" (paramErr: error in user parameter list) (-50)
[19043:3335:1215/051126.117040:WARNING:vt_video_decode_accelerator_mac.cc(169)] Failed to create VTDecompressionSession: Error Domain=NSOSStatusErrorDomain Code=-8973 "The operation couldn?t be completed. (OSStatus error -8973.)" (codecOpenErr) (-8973)
[19043:3335:1215/051126.118938:WARNING:vt_video_decode_accelerator_mac.cc(191)] Failed to create hardware VideoToolbox session
[19043:3335:1215/051126.206594:ERROR:vt_video_encode_accelerator_mac.cc(518)]  VTCompressionSessionCreate failed: -12908
[19032:7175:1215/051127.967266:INFO:CONSOLE(0)] "[SUCCESS] canOpenUpToThreeOffscreenTabs", source: chrome-extension://ddchlicdkolnonkihahngkmmmjnjlkkf/max_offscreen_tabs.html (0)
[19032:2823:1215/051128.200866:ERROR:mach_port_broker.mm(175)] Unknown process 19055 is sending Mach IPC messages!
[19032:40195:1215/051128.269362:ERROR:service_manager_context.cc(143)] Attempting to run unsupported native service: /b/swarm_slave/w/irG1J2Gd/out/Release/./content_browser/content_browser.service
[19032:2823:1215/051128.280346:ERROR:mach_port_broker.mm(175)] Unknown process 19056 is sending Mach IPC messages!
[19032:2823:1215/051128.317906:ERROR:mach_port_broker.mm(175)] Unknown process 19057 is sending Mach IPC messages!
[19032:40195:1215/051128.269916:FATAL:interface_endpoint_client.cc(32)] Check failed: !is_valid. The callback passed to Connector::Connect() was never run.
0   browser_tests                       0x000000010acf4e23 _ZN4base5debug10StackTraceC1Ev + 19
1   browser_tests                       0x000000010ad55bc0 _ZN7logging10LogMessageD2Ev + 336
2   browser_tests                       0x000000010f01520e _ZN4mojo12_GLOBAL__N_115DCheckIfInvalidERKN4base7WeakPtrINS_23InterfaceEndpointClientEEERKNSt3__112basic_stringIcNS7_11char_traitsIcEENS7_9allocatorIcEEEE + 734
3   browser_tests                       0x000000010f0149f5 _ZN4mojo12_GLOBAL__N_114ResponderThunk13DCheckInvalidERKNSt3__112basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEE + 437
4   browser_tests                       0x000000010652cc6b _ZN4base8internal9BindStateIMN15service_manager5mojom34Connector_Connect_ProxyToResponderEFvNS3_13ConnectResultERKNSt3__112basic_stringIcNS6_11char_traitsIcEENS6_9allocatorIcEEEEEJNS0_13PassedWrapperINS6_10unique_ptrIS4_NS6_14default_deleteIS4_EEEEEEEED2Ev + 491
5   browser_tests                       0x000000010652ca66 _ZN4base8internal9BindStateIMN15service_manager5mojom34Connector_Connect_ProxyToResponderEFvNS3_13ConnectResultERKNSt3__112basic_stringIcNS6_11char_traitsIcEENS6_9allocatorIcEEEEEJNS0_13PassedWrapperINS6_10unique_ptrIS4_NS6_14default_deleteIS4_EEEEEEEE7DestroyEPKNS0_13BindStateBaseE + 22
6   browser_tests                       0x000000010688fe53 _ZN15service_manager13ConnectParamsD1Ev + 35
7   browser_tests                       0x00000001068b2d9b _ZN4base8internal13FunctorTraitsIMN15service_manager14ServiceManagerEFvNSt3__110unique_ptrINS2_13ConnectParamsENS4_14default_deleteIS6_EEEEN4mojo12InterfacePtrINS2_5mojom7ServiceEEEbNS_7WeakPtrINS3_8InstanceEEENSA_9StructPtrINSC_13ResolveResultEEEEvE6InvokeIRKNSF_IS3_EEJS9_SE_RKbRKSH_SK_EEEvSM_OT_DpOT0_ + 1307
8   browser_tests                       0x00000001068b2697 _ZN4base8internal7InvokerINS0_9BindStateIMN15service_manager14ServiceManagerEFvNSt3__110unique_ptrINS3_13ConnectParamsENS5_14default_deleteIS7_EEEEN4mojo12InterfacePtrINS3_5mojom7ServiceEEEbNS_7WeakPtrINS4_8InstanceEEENSB_9StructPtrINSD_13ResolveResultEEEEJNSG_IS4_EENS0_13PassedWrapperISA_EENSP_ISF_EEbSI_EEEFvSL_EE7RunImplIRKSN_RKNS5_5tupleIJSO_SQ_SR_bSI_EEEJLm0ELm1ELm2ELm3ELm4EEEEvOT_OT0_NS_13IndexSequenceIJXspT1_EEEEOSL_ + 1079
9   browser_tests                       0x00000001065320b5 _ZN15service_manager5mojom42Resolver_ResolveMojoName_ForwardToCallback6AcceptEPN4mojo7MessageE + 757
10  browser_tests                       0x000000010f00fbf5 _ZN4mojo23InterfaceEndpointClient22HandleValidatedMessageEPNS_7MessageE + 2773
11  browser_tests                       0x000000010f00e581 _ZN4mojo11FilterChain6AcceptEPNS_7MessageE + 513
12  browser_tests                       0x000000010f012e69 _ZN4mojo23InterfaceEndpointClient21HandleIncomingMessageEPNS_7MessageE + 281
13  browser_tests                       0x000000010f025ac1 _ZN4mojo8internal15MultiplexRouter22ProcessIncomingMessageEPNS_7MessageENS1_18ClientCallBehaviorEPN4base22SingleThreadTaskRunnerE + 2513
14  browser_tests                       0x000000010f024691 _ZN4mojo8internal15MultiplexRouter6AcceptEPNS_7MessageE + 609
15  browser_tests                       0x000000010f00e581 _ZN4mojo11FilterChain6AcceptEPNS_7MessageE + 513
16  browser_tests                       0x000000010f00366c _ZN4mojo9Connector17ReadSingleMessageEPj + 604
17  browser_tests                       0x000000010f004244 _ZN4mojo9Connector21OnHandleReadyInternalEj + 452
18  browser_tests                       0x000000010f0430a3 _ZN4mojo7Watcher13OnHandleReadyEj + 595
19  browser_tests                       0x000000010f042b1b _ZN4mojo7Watcher17CallOnHandleReadyEmj22MojoHandleSignalsStatej + 523
20  browser_tests                       0x0000000110fac60d _ZN4mojo3edk7Watcher19MaybeInvokeCallbackEjRKNS0_18HandleSignalsStateEj + 525
21  browser_tests                       0x0000000110f98b0b _ZN4mojo3edk14RequestContextD2Ev + 1275
22  browser_tests                       0x0000000110f98b13 _ZN4mojo3edk14RequestContextD2Ev + 1283
23  browser_tests                       0x0000000110f98b13 _ZN4mojo3edk14RequestContextD2Ev + 1283
24  browser_tests                       0x0000000110f6199d _ZN4mojo3edk11NodeChannel16OnChannelMessageEPKvmNSt3__110unique_ptrINS4_6vectorINS0_14PlatformHandleENS4_9allocatorIS7_EEEENS0_27PlatformHandleVectorDeleterEEE + 10477
25  browser_tests                       0x0000000110f1dc7f _ZN4mojo3edk7Channel14OnReadCompleteEmPm + 1903
26  browser_tests                       0x0000000110f22183 _ZN4mojo3edk12_GLOBAL__N_112ChannelPosix28OnFileCanReadWithoutBlockingEi + 1411
27  browser_tests                       0x000000010ad9c785 _ZN4base19MessagePumpLibevent22OnLibeventNotificationEisPv + 1189
28  browser_tests                       0x000000010e7480fd event_base_loop + 4061
29  browser_tests                       0x000000010ad9ce19 _ZN4base19MessagePumpLibevent3RunEPNS_11MessagePump8DelegateE + 569
30  browser_tests                       0x000000010ad918d1 _ZN4base11MessageLoop10RunHandlerEv + 817
31  browser_tests                       0x000000010ae202da _ZN4base7RunLoop3RunEv + 362
32  browser_tests                       0x000000010aec67e4 _ZN4base6Thread3RunEPNS_7RunLoopE + 468
33  browser_tests                       0x0000000108eb9f4d _ZN7content17BrowserThreadImpl11IOThreadRunEPN4base7RunLoopE + 237
34  browser_tests                       0x0000000108eba36c _ZN7content17BrowserThreadImpl3RunEPN4base7RunLoopE + 716
35  browser_tests                       0x000000010aec7461 _ZN4base6Thread10ThreadMainEv + 1841
36  browser_tests                       0x000000010aeb291e _ZN4base12_GLOBAL__N_110ThreadFuncEPv + 206
37  libsystem_pthread.dylib             0x00007fff88afa899 _pthread_body + 138
38  libsystem_pthread.dylib             0x00007fff88afa72a _pthread_struct_init + 0
39  libsystem_pthread.dylib             0x00007fff88afefc9 thread_start + 13


miu@: Can you take a look? Please triage further if you are not the right owner for this.