Reland Queue commands to the Os to start a video device.

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 # running overnight and removing outdated bugs/suppressions.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 3564 matching lines @@
    fun:_ZN4mojo6common15MessagePumpMojo6CreateEv
 }
 {
    bug_449551
    Memcheck:Leak
    fun:_Znw*
    ...
    fun:_ZN8app_list4test17SearchHistoryTest5SetUpEv
 }
 {
-   bug_450226
-   Memcheck:Leak
-   fun:_Znw*
-   ...
-   fun:_ZN7content19VideoCaptureManager16QueueStartDeviceEiPNS0_11DeviceEntryERKN5media18VideoCaptureParamsE
-   fun:_ZN7content19VideoCaptureManager21StartCaptureForClientEiRKN5media18VideoCaptureParamsEiNS_24VideoCaptureControllerIDEPNS_34VideoCaptureControllerEventHandlerERKN4base8CallbackIFvRKNS8_7WeakPtrINS_22VideoCaptureControllerEEEEEE
-   fun:_ZN7content16VideoCaptureHost14OnStartCaptureEiiRKN5media18VideoCaptureParamsE
-   fun:_ZN7content20VideoCaptureHostTest16StartStopCaptureEv
-   fun:_ZN7content47VideoCaptureHostTest_StopWhileStartPending_Test8TestBodyEv
-}
-{
    bug_450228
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN9__gnu_cxx13new_allocatorISt13_Rb_tree_nodeISt4pairIKi10linked_ptrIN4base19SequencedWorkerPool6WorkerEEEEE8allocateEmPKv
    fun:_ZNSt8_Rb_treeIiSt4pairIKi10linked_ptrIN4base19SequencedWorkerPool6WorkerEEESt10_Select1stIS7_ESt4lessIiESaIS7_EE11_M_get_nodeEv
    fun:_ZNSt8_Rb_treeIiSt4pairIKi10linked_ptrIN4base19SequencedWorkerPool6WorkerEEESt10_Select1stIS7_ESt4lessIiESaIS7_EE14_M_create_nodeIJS0_IiS6_EEEEPSt13_Rb_tree_nodeIS7_EDpOT_
    fun:_ZNSt8_Rb_treeIiSt4pairIKi10linked_ptrIN4base19SequencedWorkerPool6WorkerEEESt10_Select1stIS7_ESt4lessIiESaIS7_EE10_M_insert_IS0_IiS6_EEESt17_Rb_tree_iteratorIS7_EPKSt18_Rb_tree_node_baseSK_OT_
    fun:_ZNSt8_Rb_treeIiSt4pairIKi10linked_ptrIN4base19SequencedWorkerPool6WorkerEEESt10_Select1stIS7_ESt4lessIiESaIS7_EE16_M_insert_uniqueIS0_IiS6_EEES0_ISt17_Rb_tree_iteratorIS7_EbEOT_
    fun:_ZNSt3mapIi10linked_ptrIN4base19SequencedWorkerPool6WorkerEESt4lessIiESaISt4pairIKiS4_EEE6insertIS7_IiS4_EvEES7_ISt17_Rb_tree_iteratorIS9_EbEOT_
    fun:_ZN4base19SequencedWorkerPool5Inner10ThreadLoopEPNS0_6WorkerE
    fun:_ZN4base19SequencedWorkerPool6Worker3RunEv
    fun:_ZN4base12SimpleThread10ThreadMainEv
    fun:_ZN4base12_GLOBAL__N_110ThreadFuncEPv
 }