Valgrind: Add a new suppression and update another.

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 # running overnight and removing outdated bugs/suppressions.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 2966 matching lines @@
    fun:_ZN4base11MessageLoop13CreateUnboundENS0_4TypeENS_8Callback*
    fun:_ZN4base6Thread16StartWithOptionsERKNS0_7OptionsE
    fun:_ZN4base6Thread5StartEv
    fun:_ZN4base6Thread22StartAndWaitForTestingEv
    fun:_ZN12browser_sync12_GLOBAL__N_124SyncBackendRegistrarTest5SetUpEv
 }
 {
    bug_576259_a
    Memcheck:Uninitialized
    fun:_ZN7GrGLGpu11bindTextureEiRK15GrTextureParamsbP11GrGLTexture
+   ...
    fun:_ZN7GrGLGpu12flushGLStateERK10GrPipelineRK20GrPrimitiveProcessor
    fun:_ZN7GrGLGpu6onDrawERK10GrPipelineRK20GrPrimitiveProcessorPK6GrMeshi
    fun:_ZN5GrGpu4drawERK10GrPipelineRK20GrPrimitiveProcessorPK6GrMeshi
    fun:_ZN13GrVertexBatch6onDrawEP17GrBatchFlushState
-   ...
-   fun:_ZN2cc17SingleThreadProxy36ScheduledActionDrawAndSwapIfPossibleEv
 }
 {
    bug_576259_b
    Memcheck:Uninitialized
    ...
    fun:_ZN8GrGLCaps4initERK16GrContextOptionsRK15GrGLContextInfoPK13GrGLInterface
    fun:_ZN8GrGLCapsC1ERK16GrContextOptionsRK15GrGLContextInfoPK13GrGLInterface
    fun:_ZN15GrGLContextInfoC1ERKNS_15ConstructorArgsE
    fun:_ZN11GrGLContextC2ERKN15GrGLContextInfo15ConstructorArgsE
    ...
@@ skipping 145 matching lines @@
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN4mojo3edk2js13HandleWrapper6Create*
    fun:_ZN3gin9ConverterIN4mojo6Handle*
    fun:_ZN3gin11ConvertToV8IN4mojo6Handle*
    fun:_ZN3gin10ToV8TraitsIN4mojo6HandleELb0EE14TryConvertToV8*
    fun:_ZN3gin14TryConvertToV8IN4mojo6Handle*
    fun:_ZN3gin10Dictionary3SetIN4mojo6Handle*
    fun:_ZN4mojo3edk2js12_GLOBAL__N_114CreateDataPipe*
 }
+{
+   bug_602964
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN4base4BindIMNS_12_GLOBAL__N_121PostTaskAndReplyRelayEFvvEJNS_8internal17UnretainedWrapper*
+   fun:_ZN4base8internal20PostTaskAndReplyImpl16PostTaskAndReplyERKN15tracked_objects8LocationERKNS*
+   fun:_ZN4base10TaskRunner16PostTaskAndReplyERKN15tracked_objects8LocationERKNS_8CallbackIFvvELNS*
+   fun:_ZN4base26PostTaskAndReplyWithResultIN3net20WifiPHYLayerProtocolES2_EEbPNS*
+   fun:_ZN7metrics22NetworkMetricsProvider25ProbeWifiPHYLayerProtocolEv
+}