Update from https://crrev.com/306655

tools/valgrind/memcheck/suppressions.txt

 # There are four kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 3417 matching lines @@
 }
 {
    bug_431213
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN3gin22CreateFunctionTemplateIFSsPN4mojo2js13HandleWrapperEEEEN2v85LocalINS6_16FunctionTemplateEEEPNS6_7IsolateEN4base8CallbackIT_EEi
    fun:_ZN3gin12_GLOBAL__N_114CallbackTraitsIMN4mojo2js13HandleWrapperEFSsvEvE14CreateTemplateEPN2v87IsolateES6_
    fun:_ZN3gin21ObjectTemplateBuilder9SetMethodIMN4mojo2js13HandleWrapperEFSsvEEERS0_RKN4base16BasicStringPieceISsEERKT_
    fun:_ZN4mojo2js13HandleWrapper24GetObjectTemplateBuilderEPN2v87IsolateE
 }
+{
+   bug_436110
+   Memcheck:Param
+   socketcall.sendto(msg)
+   fun:send
+   fun:_ZN4mojo8embedder20PlatformChannelWriteENS0_14PlatformHandleEPKvm
+   fun:_ZN4mojo6system12_GLOBAL__N_115RawChannelPosix11WriteNoLockEPmS3_
+   fun:_ZN4mojo6system12_GLOBAL__N_115RawChannelPosix29OnFileCanWriteWithoutBlockingEi
+   fun:_ZThn112_N4mojo6system12_GLOBAL__N_115RawChannelPosix29OnFileCanWriteWithoutBlockingEi
+   fun:_ZN4base19MessagePumpLibevent21FileDescriptorWatcher29OnFileCanWriteWithoutBlockingEiPS0_
+   fun:_ZN4base19MessagePumpLibevent22OnLibeventNotificationEisPv
+   fun:event_process_active
+   fun:event_base_loop
+   fun:_ZN4base19MessagePumpLibevent3RunEPNS_11MessagePump8DelegateE
+   fun:_ZN4base11MessageLoop10RunHandlerEv
+}
+{
+   bug_436110_a
+   Memcheck:Param
+   socketcall.sendto(msg)
+   fun:send
+   fun:_ZN4mojo8embedder20PlatformChannelWriteENS0_14PlatformHandleEPKvm
+   fun:_ZN4mojo6system12_GLOBAL__N_115RawChannelPosix11WriteNoLockEPmS3_
+   fun:_ZN4mojo6system10RawChannel12WriteMessageE10scoped_ptrINS0_16MessageInTransitEN4base14DefaultDeleterIS3_EEE
+   fun:_ZN4mojo6system7Channel12WriteMessageE10scoped_ptrINS0_16MessageInTransitEN4base14DefaultDeleterIS3_EEE
+   fun:_ZN4mojo6system15ChannelEndpoint18WriteMessageNoLockE10scoped_ptrINS0_16MessageInTransitEN4base14DefaultDeleterIS3_EEE
+   fun:_ZN4mojo6system15ChannelEndpoint14EnqueueMessageE10scoped_ptrINS0_16MessageInTransitEN4base14DefaultDeleterIS3_EEE
+   fun:_ZN4mojo6system24ProxyMessagePipeEndpoint14EnqueueMessageE10scoped_ptrINS0_16MessageInTransitEN4base14DefaultDeleterIS3_EEE
+   fun:_ZN4mojo6system11MessagePipe14EnqueueMessageEj10scoped_ptrINS0_16MessageInTransitEN4base14DefaultDeleterIS3_EEEPSt6vectorINS0_19DispatcherTransportESaIS9_EE
+   fun:_ZN4mojo6system11MessagePipe12WriteMessageEjNS0_11UserPointerIKvEEjPSt6vectorINS0_19DispatcherTransportESaIS6_EEj
+   fun:_ZN4mojo6system21MessagePipeDispatcher22WriteMessageImplNoLockENS0_11UserPointerIKvEEjPSt6vectorINS0_19DispatcherTransportESaIS6_EEj
+   fun:_ZN4mojo6system10Dispatcher12WriteMessageENS0_11UserPointerIKvEEjPSt6vectorINS0_19DispatcherTransportESaIS6_EEj
+   fun:_ZN4mojo6system4Core12WriteMessageEjNS0_11UserPointerIKvEEjNS2_IKjEEjj
+   fun:MojoWriteMessage
+}
+{
+   bug_436110_b
+   Memcheck:Param
+   sendmsg(msg.msg_iov[0])
+   obj:/lib/x86_64-linux-gnu/libpthread-2.15.so
+   fun:_ZN4mojo8embedder33PlatformChannelSendmsgWithHandlesENS0_14PlatformHandleEP5iovecmPS1_m
+   ...
+   fun:MojoWriteMessage
+}
+{
+   bug_436172
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN3IPC11SyncChannelC1EPNS_8ListenerERK13scoped_refptrIN4base22SingleThreadTaskRunnerEEPNS4_13WaitableEventE
+   ...
+   fun:_ZN7content28BrowserGpuChannelHostFactory16EstablishRequest12FinishOnMainEv
+}
+{
+   bug_436172_b
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN3IPC7Channel6CreateERKNS_13ChannelHandleENS0_4ModeEPNS_8ListenerE
+   fun:_ZN3IPC12_GLOBAL__N_122PlatformChannelFactory12BuildChannelEPNS_8ListenerE
+   fun:_ZN3IPC12ChannelProxy7Context13CreateChannelE10scoped_ptrINS_14ChannelFactoryEN4base14DefaultDeleterIS3_EEE
+   ...
+   fun:_ZN7content28BrowserGpuChannelHostFactory16EstablishRequest12FinishOnMainEv
+}
+{
+   bug_436172_c
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN3IPC12ChannelProxy7ContextC1EPNS_8ListenerERK13scoped_refptrIN4base22SingleThreadTaskRunnerEE
+   fun:_ZN3IPC11SyncChannel11SyncContextC1EPNS_8ListenerERK13scoped_refptrIN4base22SingleThreadTaskRunnerEEPNS5_13WaitableEventE
+   fun:_ZN3IPC11SyncChannelC1EPNS_8ListenerERK13scoped_refptrIN4base22SingleThreadTaskRunnerEEPNS4_13WaitableEventE
+   fun:_ZN3IPC11SyncChannel6CreateEPNS_8ListenerERK13scoped_refptrIN4base22SingleThreadTaskRunnerEEPNS4_13WaitableEventE
+   ...
+   fun:_ZN7content28BrowserGpuChannelHostFactory16EstablishRequest12FinishOnMainEv
+}
+{
+   bug_436172_d
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN7content14GpuChannelHost7ConnectERKN3IPC13ChannelHandleEPN4base13WaitableEventE
+   fun:_ZN7content14GpuChannelHost6CreateEPNS_21GpuChannelHostFactoryERKN3gpu7GPUInfoERKN3IPC13ChannelHandleEPN4base13WaitableEventEPNS3_22GpuMemoryBufferManagerE
+   fun:_ZN7content28BrowserGpuChannelHostFactory21GpuChannelEstablishedEv
+   fun:_ZN7content28BrowserGpuChannelHostFactory16EstablishRequest12FinishOnMainEv
+}
+{
+   Expected_leak_due_to_gpu_thread_leaked_by_lazy_instance
+   Memcheck:Leak
+   fun:calloc
+   fun:pthread_setspecific
+   ...
+   fun:_ZN3gpu22InProcessCommandBuffer21InitializeOnGpuThreadERKNS0_27InitializeOnGpuThreadParamsE
+}