Repro step:

1) Run debug build of chrome for chromeos on glinux with --ash-debug-shortcuts flag
2) open one browser window
3) swtich to tablet using ctrl-alt-shift-t
4) go overview mode by clicking overview button
5) in overview mode, click "launcher" button

dcastagna@, can you take a look?

[194395:194395:1113/121741.269172:ERROR:textfield.cc(1777)] Not implemented reached in virtual bool views::Textfield::ShouldDoLearning()
[194395:194395:1113/121749.255635:FATAL:gles2_implementation_impl_autogen.h(579)] Check failed: textures[i] != 0. 
#0 0x7fb1fce38d5f base::debug::StackTrace::StackTrace()
#1 0x7fb1fcd6892b logging::LogMessage::~LogMessage()
#2 0x7fb1f5043510 gpu::gles2::GLES2Implementation::DeleteTextures()
#3 0x7fb1f9b56bee skia_bindings::GLES2ImplementationWithGrContextSupport::DeleteTextures()
#4 0x7fb1ed72fc91 viz::GLRenderer::UpdateRPDQShadersForBlending()
#5 0x7fb1ed72f0e7 viz::GLRenderer::DrawRenderPassQuadInternal()
#6 0x7fb1ed72abdc viz::GLRenderer::DrawRenderPassQuad()
#7 0x7fb1ed729e62 viz::GLRenderer::DoDrawQuad()
#8 0x7fb1ed70fb96 viz::DirectRenderer::DrawRenderPass()
#9 0x7fb1ed70ecdb viz::DirectRenderer::DrawRenderPassAndExecuteCopyRequests()
#10 0x7fb1ed70e4e1 viz::DirectRenderer::DrawFrame()
#11 0x7fb1ed714779 viz::Display::DrawAndSwap()
#12 0x7fb1ed7234b5 viz::DisplayScheduler::DrawAndSwap()
#13 0x7fb1ed722b97 viz::DisplayScheduler::AttemptDrawAndSwap()
#14 0x7fb1ed7223d6 viz::DisplayScheduler::OnBeginFrameDeadline()
#15 0x7fb1ed7252d7 _ZN4base8internal7InvokerINS0_9BindStateIMN3viz16DisplaySchedulerEFvvEJNS_7WeakPtrIS4_EEEEEFvvEE3RunEPNS0_13BindStateBaseE
#16 0x7fb1ed72585f _ZN4base8internal22CancelableCallbackImplINS_17RepeatingCallbackIFvvEEEE16ForwardRepeatingIJEEEvDpT_
#17 0x7fb1ed7252d7 _ZN4base8internal7InvokerINS0_9BindStateIMN3viz16DisplaySchedulerEFvvEJNS_7WeakPtrIS4_EEEEEFvvEE3RunEPNS0_13BindStateBaseE
#18 0x7fb1fcd4bc3a base::debug::TaskAnnotator::RunTask()
#19 0x7fb1fcd77def base::MessageLoopImpl::RunTask()
#20 0x7fb1fcd78383 base::MessageLoopImpl::DoWork()
#21 0x7fb1fce5c5b9 base::MessagePumpLibevent::Run()
#22 0x7fb1fcd77994 base::MessageLoopImpl::Run()
#23 0x7fb1fcda9579 base::RunLoop::Run()
#24 0x55aafabda9dd ChromeBrowserMainParts::MainMessageLoopRun()
#25 0x7fb1f9cd28b7 content::BrowserMainLoop::RunMainMessageLoopParts()
#26 0x7fb1f9cd53b6 content::BrowserMainRunnerImpl::Run()
#27 0x7fb1f9ccee79 content::BrowserMain()
#28 0x7fb1fa7a0ac6 content::ContentMainRunnerImpl::Run()
#29 0x7fb1ed2eff46 service_manager::Main()
#30 0x7fb1fa79edb4 content::ContentMain()
#31 0x55aaf9da8c33 ChromeMain
#32 0x7fb1ed8b32b1 __libc_start_main
#33 0x55aaf9da8aaa _start