Suppress bug 50638 - Mac UI Valgrind report on gleUpdateViewScissorData

BUG=50638
TBR=glider
Review URL: http://codereview.chromium.org/3029039

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@54126 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/memcheck/suppressions_mac.txt

@@ -1577,3 +1577,14 @@
    fun:_ZN4base19MessagePumpLibevent3RunEPNS_11MessagePump8DelegateE
    fun:_ZN11MessageLoop11RunInternalEv
 }
+{
+   bug_50638
+   Memcheck:Cond
+   fun:gleUpdateViewScissorData
+   ...
+   fun:cgl_set_surface
+   fun:ogl_attach_surface
+   fun:ogl_render_fade_transition
+   fun:ogl_render_layer_
+   fun:ogl_render_layers
+}