Add valgrind supp for NV driver.

tools/valgrind.supp

 # Pass this file to Valgrind with "--suppressions=tools/valgrind.supp"
 
 # Third party lib, driver issues.
 {
     ati_driver_bug_1
     Memcheck:Param
     ioctl(generic)
     fun:ioctl
     ...
     obj:/usr/lib/x86_64-linux-gnu/dri/fglrx_dri.so
@@ skipping 54 matching lines @@
 {
     nv_driver_bug_1
     Memcheck:Param
     write(buf)
     ...
     obj:/usr/lib/libnvidia-glcore.so*
 }
 {
     nv_driver_bug_2
     Memcheck:Cond
     obj:/usr/lib/libnvidia-glcore.so*

[mtklein, 2014/06/25 13:28:02]

I think nv_driver_bug_4 now subsumes nv_driver_bug_2.  Merge?

[bsalomon, 2014/06/25 15:09:05]

Done.

 }
 {
     nv_driver_bug_3
     Memcheck:Leak
     fun:calloc
     obj:/usr/lib*/libGL.so*
 }
 {
+    nv_driver_bug_4
+    Memcheck:Cond
+    ...
+    obj:/usr/lib/libnvidia-glcore.so*
+}
+{
     font_config_bug_1
     Memcheck:Addr4
     fun:FcConfigFileExists
 }
 {
     font_config_bug_2
     Memcheck:Leak
     fun:malloc
     fun:FcFontSetCreate
 }
@@ skipping 99 matching lines @@
 {
     gpu_issue_14
     Memcheck:Addr4
     fun:_ZN22GrAAConvexPathRenderer10onDrawPathERK6SkPathRK11SkStrokeRecP12GrDrawTargetb
 }
 {
     gpu_issue_15
     Memcheck:Addr2
     fun:_ZN22GrAAConvexPathRenderer10onDrawPathERK6SkPathRK11SkStrokeRecP12GrDrawTargetb
 }