Suppress another memory leak in skia to get the bots green(er)

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 # running overnight and removing outdated bugs/suppressions.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 5806 matching lines @@
    fun:_ZN8chromeos21DBusThreadManagerImplC1ENS_28DBusClientImplementationTypeE
    fun:_ZN8chromeos17DBusThreadManager10InitializeEv
    fun:_ZN8chromeos23KioskModeIdleLogoutTest5SetUpEv
 }
 {
    bug_144930
    Memcheck:Leak
    fun:_Znw*
    fun:_ZL20cachedPaintLuminancef
 }
+{
+   bug_144930_b
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZL21cachedDeviceLuminancef
+}
 
 #-----------------------------------------------------------------------
 # 4. These only occur on our Google workstations
 
 {
    bug_todo_getdelim
    Memcheck:Leak
    fun:malloc
    fun:getdelim
    ...
    fun:call_init
    fun:_dl_init
 }
 {
    bug_todo_getdelim2
    Memcheck:Leak
    fun:malloc
    fun:getdelim
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
 }
 {
    bug_todo_grep
    Memcheck:Leak
    fun:malloc
    obj:/bin/grep
    obj:/bin/grep
 }