Suppress four really common valgrind warnings in mac ui tests....

tools/valgrind/memcheck/suppressions_mac.txt

 # There are three kinds of suppressions in this file:
 # 1. Third party stuff we have no control over.
 #
 # 2. Intentional unit test errors, 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.
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 162 matching lines @@
    plugin_bundle_global_leak
    Memcheck:Leak
    fun:malloc
    fun:__cxa_get_globals
    fun:__cxa_allocate_exception
    fun:_ZN4dyld4loadEPKcRKNS_11LoadContextE
    fun:dlopen
    fun:dlopen
    fun:_CFBundleDlfcnCheckLoaded
 }
+{
+   bug_18215
+   Memcheck:Cond
+   fun:_DPSNextEvent
+   fun:-[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:]
+   fun:-[NSApplication run]
+}
 
 # 2. Intentional unit test errors, 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.
 {
    # Mac test_shell_tests, see http://crbug.com/9561
    bug_9561
    Memcheck:Leak
    fun:malloc_zone_malloc
@@ skipping 128 matching lines @@
    fun:_Znwm
    fun:_ZN3IPC11SyncChannelC1ERKSsNS_7Channel4ModeEPNS3_8ListenerEPNS_12ChannelProxy13MessageFilterEP11MessageLoopbPN4base13WaitableEventE
    fun:_ZN11ChildThread4InitEv
    fun:_ZN12RenderThread4InitEv
    fun:_ZN4base6Thread10ThreadMainEv
    fun:_ZL10ThreadFuncPv
    fun:_pthread_start
    fun:thread_start
 }
 {
+   bug_16661
+   Memcheck:Leak
+   fun:_Znwm
+   fun:_ZN4base19MessagePumpLibevent19WatchFileDescriptorEibNS0_4ModeEPNS0_21FileDescriptorWatcherEPNS0_7WatcherE
+   fun:_ZN16MessageLoopForIO19WatchFileDescriptorEibNS_4ModeEPN4base19MessagePumpLibevent21FileDescriptorWatcherEPNS2_7WatcherE
+   fun:_ZN3IPC7Channel11ChannelImpl23ProcessOutgoingMessagesEv
+   fun:_ZN3IPC7Channel11ChannelImpl4SendEPNS_7MessageE
+   fun:_ZN3IPC7Channel4SendEPNS_7MessageE
+   fun:_ZN3IPC12ChannelProxy7Context13OnSendMessageEPNS_7MessageE
+   fun:_ZN3IPC8SendTask3RunEv
+}
+{
   bug_17297
   Memcheck:Leak
   fun:malloc
   ...
   fun:+[NSColor keyboardFocusIndicatorColor]
   fun:+[NSColor colorWithCatalogName:colorName:]
   fun:+[NSCatalogColor newWithCoder:zone:]
   fun:-[NSColor initWithCoder:]
 }
 {
    # 1 in 5 runs on mac?
    bug_17888
    Memcheck:Leak
    fun:_Znwm
    fun:_ZN3IPC7ChannelC2ERKSsNS0_4ModeEPNS0_8ListenerE
    fun:_ZN3IPC7ChannelC1ERKSsNS0_4ModeEPNS0_8ListenerE
    fun:_ZN3IPC12ChannelProxy7Context13CreateChannelERKSsRKNS_7Channel4ModeE
    fun:_ZN3IPC12ChannelProxy4InitERKSsNS_7Channel4ModeEP11MessageLoopb
    fun:_ZN3IPC12ChannelProxyC2ERKSsNS_7Channel4ModeEP11MessageLoopPNS0_7ContextEb
    fun:_ZN3IPC11SyncChannelC2ERKSsNS_7Channel4ModeEPNS3_8ListenerEPNS_12ChannelProxy13MessageFilterEP11MessageLoopbPN4base13WaitableEventE
    fun:_ZN3IPC11SyncChannelC1ERKSsNS_7Channel4ModeEPNS3_8ListenerEPNS_12ChannelProxy13MessageFilterEP11MessageLoopbPN4base13WaitableEventE
    fun:_ZN11ChildThread4InitEv
 }
+{
+   bug_18218
+   Memcheck:Leak
+   fun:malloc
+   fun:__addHandler2
+   fun:__NSFinalizeThreadData
+   fun:_pthread_tsd_cleanup
+   fun:_pthread_exit
+   fun:thread_start
+}
+{
+   bug_18219
+   Memcheck:Leak
+   fun:malloc_zone_malloc
+   fun:_CFRuntimeCreateInstance
+   fun:CGTypeCreateInstanceWithAllocator
+   fun:CGTypeCreateInstance
+   fun:CGImageCreate
+   fun:_NSCreateImageRef2
+   fun:-[CIImage(NSAppKitAdditions) initWithBitmapImageRep:]
+   fun:-[ThrobberFilmstripDelegate initWithImage:]
+   fun:+[ThrobberView filmstripThrobberViewWithFrame:image:]
+   fun:-[TabStripController tabChangedWithContents:atIndex:loadingOnly:]
+   fun:_ZN27TabStripModelObserverBridge12TabChangedAtEP11TabContentsib
+}