valgrind: Suppress an unitialized read.

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 # running overnight and removing outdated bugs/suppressions.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 6183 matching lines @@
 {
    bug_386418
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN4base8internal20PostTaskAndReplyImpl16PostTaskAndReplyERKN15tracked_objects8LocationERKNS_8CallbackIFvvEEESA_
    fun:_ZN4base10WorkerPool16PostTaskAndReplyERKN15tracked_objects8LocationERKNS_8CallbackIFvvEEES9_b
    fun:_ZN3net16HostResolverImpl16LoopbackProbeJobC1ERKN4base7WeakPtrIS0_EE
    fun:_ZN3net16HostResolverImplC1ERKNS_12HostResolver7OptionsEPNS_6NetLogE
    fun:_ZN8chromeos24HostResolverImplChromeOSC1E13*
 }
+{
+   bug_387993
+   Memcheck:Uninitialized
+   fun:_ZN11SkBaseMutex7acquireEv
+   fun:_ZN18SkAutoMutexAcquireC2EP11SkBaseMutex
+   fun:_ZN18SkAutoMutexAcquireC1EP11SkBaseMutex
+   fun:_ZN12SkGlyphCache10VisitCacheEP10SkTypefacePK12SkDescriptorPFbPKS_PvES7_
+   fun:_ZN12SkGlyphCache11DetachCacheEP10SkTypefacePK12SkDescriptor
+   fun:_ZL14DetachDescProcP10SkTypefacePK12SkDescriptorPv
+   fun:_ZNK7SkPaint14descriptorProcEPK18SkDevicePropertiesPK8SkMatrixPFvP10SkTypefacePK12SkDescriptorPvESB_b
+   fun:_ZNK7SkPaint11detachCacheEPK18SkDevicePropertiesPK8SkMatrixb
+   fun:_ZN16SkAutoGlyphCacheC2ERK7SkPaintPK18SkDevicePropertiesPK8SkMatrix
+   fun:_ZN16SkAutoGlyphCacheC1ERK7SkPaintPK18SkDevicePropertiesPK8SkMatrix
+}