Suppress flaky V8 leaks on CrOS

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 # running overnight and removing outdated bugs/suppressions.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 4604 matching lines @@
    fun:_ZN4base5Value17CreateDoubleValueEd
    fun:_ZN40V8ValueConverterImplTest_WeirdTypes_Test8TestBodyEv
 }
 {
    bug_99166
    Memcheck:Leak
    ...
    fun:_ZN22AppNotificationStorage6CreateERK8FilePath
 }
 {
+   bug_99304
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN2v88internal8SkipList6UpdateEPhi
+   fun:_ZN2v88internal10PagedSpace11AllocateRawEi
+   fun:_ZN2v88internal12Deserializer8AllocateEiPNS0_5SpaceEi
+   fun:_ZN2v88internal12Deserializer10ReadObjectEiPNS0_5SpaceEPPNS0_6ObjectE
+   fun:_ZN2v88internal12Deserializer9ReadChunkEPPNS0_6ObjectES4_iPh
+   fun:_ZN2v88internal12Deserializer10ReadObjectEiPNS0_5SpaceEPPNS0_6ObjectE
+   fun:_ZN2v88internal12Deserializer9ReadChunkEPPNS0_6ObjectES4_iPh
+   fun:_ZN2v88internal12Deserializer13VisitPointersEPPNS0_6ObjectES4_
+}
+{
    bug_99307
    Memcheck:Value4
    fun:modp_b64_encode
    fun:_ZN4base12Base64EncodeERKNS_11StringPieceEPSs
    fun:_ZN11web_ui_util15GetImageDataUrlERK8SkBitmap
    fun:_ZN22InternetOptionsHandler10GetNetworkERKSsRK8SkBitmapS1_bbbN8chromeos14ConnectionTypeEbbNS5_15ActivationStateEb
    ...
    fun:_ZN22InternetOptionsHandler15FillNetworkInfoEPN4base15DictionaryValueE
 }
 {
@@ skipping 66 matching lines @@
 }
 {
    bug_todo_getdelim2
    Memcheck:Leak
    fun:malloc
    fun:getdelim
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
 }