Wire up resource cache stats dumping in nanobench

TBR=bsalomon@google.com
BUG=skia:

Review URL: https://codereview.chromium.org/1495543003
diff --git a/bench/SKPBench.cpp b/bench/SKPBench.cpp
index 6f4c688..db55b45 100644
--- a/bench/SKPBench.cpp
+++ b/bench/SKPBench.cpp
@@ -167,6 +167,7 @@
 
     int offset = keys->count();
     context->dumpGpuStatsKeyValuePairs(keys, values);
+    context->dumpCacheStatsKeyValuePairs(keys, values);
 
     // append tag, but only to new tags
     for (int i = offset; i < keys->count(); i++, offset++) {