Seeing the crash log at
https://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_rel_ng/builds/303656/steps/browser_tests%20%28with%20patch%29%20on%20Ubuntu-12.04/logs/WebUIWebViewBrowserTest.DragAndDropToInput
this seems a duplicate of  Issue 650127  .

WebUIWebViewBrowserTest.DragAndDropToInput (run #1):
[ RUN      ] WebUIWebViewBrowserTest.DragAndDropToInput
Xlib:  extension "RANDR" missing on display ":9".
Xlib:  extension "RANDR" missing on display ":9".
[458:458:0924/053704:WARNING:audio_manager.cc(317)] Multiple instances of AudioManager detected
[458:458:0924/053704:WARNING:audio_manager.cc(278)] Multiple instances of AudioManager detected
[458:458:0924/053704:WARNING:password_store_factory.cc(248)] Using basic (unencrypted) store for password storage. See https://chromium.googlesource.com/chromium/src/+/master/docs/linux_password_storage.md for more information about password storage options.
[1:2:0924/053704:ERROR:interface_registry.cc(93)] Capability spec prevented service: exe:content_browser from binding interface: visitedlink::mojom::VisitedLinkNotificationSink
[1:2:0924/053704:ERROR:interface_registry.cc(93)] Capability spec prevented service: exe:content_browser from binding interface: visitedlink::mojom::VisitedLinkNotificationSink
[1:2:0924/053704:ERROR:interface_registry.cc(93)] Capability spec prevented service: exe:content_browser from binding interface: visitedlink::mojom::VisitedLinkNotificationSink
[1:2:0924/053705:ERROR:interface_registry.cc(93)] Capability spec prevented service: exe:content_browser from binding interface: visitedlink::mojom::VisitedLinkNotificationSink
[458:458:0924/053705:INFO:CONSOLE(7548)] "Running test testDragAndDropToInput", source: webview_basic.js (7548)
[458:458:0924/053705:WARNING:CONSOLE(237)] "<webview>: The load has aborted with error -11: ERR_NOT_IMPLEMENTED.", source: extensions::webViewEvents (237)
[458:458:0924/053705:INFO:CONSOLE(11053)] "load stop of src = :about:blank", source: webview_basic.js (11053)
Received signal 11 SEGV_ACCERR 3d33bc800008
#0 0x000002afa8a7 base::debug::(anonymous namespace)::StackDumpSignalHandler()
#1 0x7f97b8d3dcb0 <unknown>
#2 0x000001af98b9 v8::internal::ScavengeVisitor::VisitPointer()
#3 0x000001a62db4 v8::internal::StandardFrame::IterateCompiledFrame()
#4 0x000001b6aba9 v8::internal::Isolate::Iterate()
#5 0x000001a96e16 v8::internal::Heap::IterateStrongRoots()
#6 0x000001a85589 v8::internal::Heap::Scavenge()
#7 0x000001a83a30 v8::internal::Heap::PerformGarbageCollection()
#8 0x000001a82d1f v8::internal::Heap::CollectGarbage()
#9 0x000001a48a25 v8::internal::Factory::NewFillerObject()
#10 0x000001cf47f7 v8::internal::__RT_impl_Runtime_AllocateInNewSpace()
#11 0x000001cf453d v8::internal::Runtime_AllocateInNewSpace()
#12 0x3ae2f27843a7 <unknown>
  r8: 000000000000000b  r9: 0000000000000000 r10: 0000000000000000 r11: 00007f97b2a27110
 r12: 00007ffcd864a428 r13: 00007ffcd8649f68 r14: 0000000000000020 r15: 0000000000000007
  di: 00007ffcd8649f68  si: 00007ffcd864a428  bp: 00003ae2f27bb5b4  bx: 0000000000000002
  dx: 00007ffcd864a418  ax: 00003d33bc810a85  cx: 00003d33bc800000  sp: 00007ffcd8649a88
  ip: 0000000001af98b9 efl: 0000000000010206 cgf: 0000000000000033 erf: 0000000000000004
 trp: 000000000000000e msk: 0000000000000000 cr2: 00003d33bc800008
[end of stack trace]
[458:458:0924/053705:INFO:CONSOLE(11056)] "finish guest load", source: webview_basic.js (11056)
[458:458:0924/053705:ERROR:CONSOLE(0)] "Unchecked runtime.lastError while running webViewInternal.executeScript: The tab was closed.", source: chrome://chrome-signin/?access_point=0&reason=0 (0)
[1:2:0924/053705:ERROR:interface_registry.cc(93)] Capability spec prevented service: exe:content_browser from binding interface: visitedlink::mojom::VisitedLinkNotificationSink
BrowserTestBase received signal: Terminated. Backtrace:
#0 0x000002afad0e base::debug::StackTrace::StackTrace()
#1 0x000003155c19 content::(anonymous namespace)::DumpStackTraceSignalHandler()
#2 0x7f4d88b320b0 <unknown>
#3 0x7f4d88be3993 __poll
#4 0x7f4d8e479ff6 <unknown>
#5 0x7f4d8e47a124 g_main_context_iteration
#6 0x000002b1b526 base::MessagePumpGlib::Run()
#7 0x000002b18fa1 base::MessageLoop::RunHandler()
#8 0x000002b3b1f0 base::RunLoop::Run()
#9 0x00000317f70c content::RunThisRunLoop()
#10 0x00000317f6aa content::RunMessageLoop()
#11 0x000000fd79f7 WebUITestHandler::WaitForResult()
#12 0x000000fd757f WebUITestHandler::RunJavaScriptTestWithResult()
#13 0x000001129afb WebUIBrowserTest::RunJavascriptUsingHandler()
#14 0x00000112a3bf WebUIBrowserTest::RunJavascriptAsyncTest()
#15 0x000000fdbe09 WebUIWebViewBrowserTest_DragAndDropToInput_Test::RunTestOnMainThread()
#16 0x000002bb4b6f InProcessBrowserTest::RunTestOnMainThreadLoop()
#17 0x0000031559a6 content::BrowserTestBase::ProxyRunTestOnMainThreadLoop()
#18 0x000002fa8233 ChromeBrowserMainParts::PreMainMessageLoopRunImpl()
#19 0x000002fa7141 ChromeBrowserMainParts::PreMainMessageLoopRun()
#20 0x0000020c40d5 content::BrowserMainLoop::PreMainMessageLoopRun()
#21 0x0000024360b6 content::StartupTaskRunner::RunAllTasksNow()
#22 0x0000020c272a content::BrowserMainLoop::CreateStartupTasks()
#23 0x0000020c712a content::BrowserMainRunnerImpl::Initialize()
#24 0x0000020bfab8 content::BrowserMain()
#25 0x000002adec0e content::RunNamedProcessTypeMain()
#26 0x000002adf66b content::ContentMainRunnerImpl::Run()
#27 0x000002addf00 content::ContentMain()
#28 0x00000315535a content::BrowserTestBase::SetUp()
#29 0x000002bb338e InProcessBrowserTest::SetUp()
#30 0x0000037bf2d8 testing::Test::Run()
#31 0x0000037c0043 testing::TestInfo::Run()
#32 0x0000037c04d7 testing::TestCase::Run()
#33 0x0000037c7517 testing::internal::UnitTestImpl::RunAllTests()
#34 0x0000037c716a testing::UnitTest::Run()
#35 0x000002bc04a3 base::TestSuite::Run()
#36 0x000002aeda29 ChromeTestSuiteRunner::RunTestSuite()
#37 0x00000317c2af content::LaunchTests()
#38 0x000002aed9b7 main
#39 0x7f4d88b1d7ed __libc_start_main
#40 0x0000005cadfd <unknown>