Suppress invalid read under gpu_info_collector::CollectGraphicsInfo

BUG=52957
TBR=glider
Review URL: http://codereview.chromium.org/3148033

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@56994 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/memcheck/suppressions.txt

@@ -4211,3 +4211,13 @@
    fun:_ZN17ExtensionsService18UninstallExtensionERKSsb
    fun:_ZN18AutomationProvider18UninstallExtensionEiPb
 }
+{
+   bug_52957
+   Memcheck:Addr4
+   fun:glGetString
+   fun:_ZN18gpu_info_collector19CollectGraphicsInfoER7GPUInfo
+   fun:_ZN9GpuThread18OnEstablishChannelEi
+   fun:_Z16DispatchToMethodI9GpuThreadMS0_FviEiEvPT_T0_RK6Tuple1IT1_E
+   fun:_ZN3IPC16MessageWithTupleI6Tuple1IiEE8DispatchI9GpuThreadMS5_FviEEEbPKNS_7MessageEPT_T0_
+   fun:_ZN9GpuThread24OnControlMessageReceivedERKN3IPC7MessageE
+}