Add MultiPictureDraw to nanobench

I would like some guard against performance regressions on our side before turning layer hoisting on in Chromium.

TBR=bsalomon@google.com

Review URL: https://codereview.chromium.org/731973005

1 files changed, 1 insertions, 1 deletions

diff --git a/include/core/SkColorTable.h b/include/core/SkColorTable.h
index 00ef8548f6..cfd5110fe0 100644
--- a/include/core/SkColorTable.h
+++ b/include/core/SkColorTable.h
@@ -65,7 +65,7 @@ public:
     */
     void unlock16BitCache() {
         SkASSERT(f16BitCacheLockCount > 0);
-        SkDEBUGCODE(f16BitCacheLockCount -= 1);
+        SkDEBUGCODE(sk_atomic_dec(&f16BitCacheLockCount);)
     }
 
     explicit SkColorTable(SkReadBuffer&);