Heapchecker: Add a new suppression for V8 AllocateBuffer leak.

TBR=guoyang@chromium.org
BUG=169678

Review URL: https://codereview.chromium.org/13741024

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@192928 0039d316-1c4b-4281-b951-d872f2087c98

tools/heapcheck/suppressions.txt

@@ -1701,6 +1701,18 @@
    fun:v8::internal::IncrementalMarking::ProcessMarkingDeque
    fun:v8::internal::IncrementalMarking::Step
 }
+{
+   bug_169678_a
+   Heapcheck:Leak
+   fun:v8::internal::SlotsBufferAllocator::AllocateBuffer
+   fun:v8::internal::SlotsBuffer::AddTo
+   fun:v8::internal::MarkCompactCollector::RecordSlot
+   fun:v8::internal::IncrementalMarkingMarkingVisitor::VisitPointers
+   ...
+   fun:v8::internal::Heap::CollectGarbage
+   ...
+   fun:v8::String::New
+}
 {
    bug_171547_b
    Heapcheck:Leak