Ensure counters are initialized, to avoid init on non-joinable threads.

src/counters.cc

Index: src/counters.cc
diff --git a/src/counters.cc b/src/counters.cc
index 0b71d439cfd53ff3f725779a6ea5859c6134c8f0..d1a1a44c9f9c65cfa7f7dd93f2b5c24c4d3b3c52 100644
--- a/src/counters.cc
+++ b/src/counters.cc
@@ -252,6 +252,30 @@ void Counters::ResetHistograms() {
 
 #define HM(name, caption) name##_.Reset();
     HISTOGRAM_LEGACY_MEMORY_LIST(HM)
+    HISTOGRAM_MEMORY_LIST(HM)
+#undef HM
+}
+
+void Counters::InitializeHistograms() {
+#define HR(name, caption, min, max, num_buckets) name##_.Enabled();
+  HISTOGRAM_RANGE_LIST(HR)
+#undef HR
+
+#define HT(name, caption, max, res) name##_.Enabled();
+  HISTOGRAM_TIMER_LIST(HT)
+#undef HT
+
+#define AHT(name, caption) name##_.Enabled();
+  AGGREGATABLE_HISTOGRAM_TIMER_LIST(AHT)
+#undef AHT
+
+#define HP(name, caption) name##_.Enabled();
+  HISTOGRAM_PERCENTAGE_LIST(HP)
+#undef HP
+
+#define HM(name, caption) name##_.Enabled();
+  HISTOGRAM_LEGACY_MEMORY_LIST(HM)
+  HISTOGRAM_MEMORY_LIST(HM)
 #undef HM
 }