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

This occurs in the wasm scenario described in the referenced bug.
DecodeWasmModule collects statistics. Blink inserts a CreateHistogramCallback that
can't instantiate a histogram on non-joinable threads. Turns out, DecodeWasmModule
is scheduled on such a thread, now that we have async compilation.

This fix pre-initializes histograms when the callback is applied, which is assumed to
be in a context that can carry out the instantiation. In Blink, this happens on the main
thread.

BUG=chromium:709684

Review-Url: https://codereview.chromium.org/2812543002
Cr-Commit-Position: refs/heads/master@{#44522}

src/api.cc

@@ -8584,6 +8584,7 @@ void Isolate::SetCreateHistogramFunction(CreateHistogramCallback callback) {
   isolate->stats_table()->SetCreateHistogramFunction(callback);
   isolate->InitializeLoggingAndCounters();
   isolate->counters()->ResetHistograms();
+  isolate->counters()->InitializeHistograms();
 }
 
 

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
 }
 

src/counters.h

@@ -1273,6 +1273,8 @@ class Counters {
 
   void ResetCounters();
   void ResetHistograms();
+  void InitializeHistograms();
+
   RuntimeCallStats* runtime_call_stats() { return &runtime_call_stats_; }
 
  private: