Call StatisticsRecorder::Initialize in GlobalHistogramAllocator's ctor

base/metrics/persistent_histogram_allocator.cc

Index: base/metrics/persistent_histogram_allocator.cc
diff --git a/base/metrics/persistent_histogram_allocator.cc b/base/metrics/persistent_histogram_allocator.cc
index 5320d3fa45920353dc272d0a4fab3a376208673e..bc22826b7d7ebdf3b0ce168e784f91ddae4e4258 100644
--- a/base/metrics/persistent_histogram_allocator.cc
+++ b/base/metrics/persistent_histogram_allocator.cc
@@ -897,7 +897,9 @@ void GlobalHistogramAllocator::DeletePersistentLocation() {
 GlobalHistogramAllocator::GlobalHistogramAllocator(
     std::unique_ptr<PersistentMemoryAllocator> memory)
     : PersistentHistogramAllocator(std::move(memory)),
-      import_iterator_(this) {}
+      import_iterator_(this) {
+  StatisticsRecorder::Initialize();

[bcwhite, 2016/09/21 19:35:11]

Let's add a comment:

Make sure the StatisticsRecorder is initialized to prevent duplicate
histograms from being created. It's safe to call this multiple times.

[scottmg, 2016/09/21 19:37:56]

Done.

+}
 
 void GlobalHistogramAllocator::ImportHistogramsToStatisticsRecorder() {
   // Skip the import if it's the histogram that was last created. Should a