add bounds sanitizer to ASAN/UBSAN bots

Change-Id: Ibe93cd564a4dcc5b9a4f88ff93770935d560e24f
Reviewed-on: https://skia-review.googlesource.com/146705
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Klein <mtklein@google.com>
diff --git a/gn/BUILD.gn b/gn/BUILD.gn
index 9149a35..a8b1a36 100644
--- a/gn/BUILD.gn
+++ b/gn/BUILD.gn
@@ -231,7 +231,7 @@
     fyi_sanitizers = fyi_sanitize
     if (sanitize == "ASAN" || sanitize == "UBSAN") {
       # ASAN implicitly runs all UBSAN checks also.
-      sanitizers = "alignment,bool,float-cast-overflow,integer-divide-by-zero,nonnull-attribute,null,pointer-overflow,return,returns-nonnull-attribute,shift,signed-integer-overflow,unreachable,vla-bound"
+      sanitizers = "alignment,bool,bounds,float-cast-overflow,integer-divide-by-zero,nonnull-attribute,null,pointer-overflow,return,returns-nonnull-attribute,shift,signed-integer-overflow,unreachable,vla-bound"
 
       if (fyi_sanitize == "" && !is_android) {
         fyi_sanitizers = "float-divide-by-zero"