Suppress gtest leak for memcheck

BUG=libyuv:729
TBR=fbarchard@chromium.org
NOTRY=True

Change-Id: Ica6bbdd5ff3112813fde61f9b335fd68fa61c731
Reviewed-on: https://chromium-review.googlesource.com/667105Reviewed-by: Henrik Kjellander <kjellander@chromium.org>
Commit-Queue: Henrik Kjellander <kjellander@chromium.org>

tools_libyuv/valgrind/memcheck/suppressions.txt

@@ -2,4 +2,20 @@
 # It acts as a place holder for future additions for this project.
 # It must exist for the Python wrapper script to work properly.
 
+# There are two of suppressions in this file.
+# 1. third_party libraries
+# 2. libyuv stuff
+# 3. libjingle stuff (talk folder)
+#-----------------------------------------------------------------------
 
+# third_party libraries
+{
+   bug_729
+   Memcheck:Free
+   fun:_ZdaPv
+   ...
+   fun:_ZN7testing8internal12UnitTestImplD1Ev
+   ...
+}
+
+# libyuv (empty so far)