Log histograms on shutdown when verbose logging is on

base/metrics/statistics_recorder.h

Index: base/metrics/statistics_recorder.h
diff --git a/base/metrics/statistics_recorder.h b/base/metrics/statistics_recorder.h
index 36b2f308af30bf8bc52d23a7ddfd9af69d22ccc7..401a786a79beb1f3e3304065f36d04d33e3c742e 100644
--- a/base/metrics/statistics_recorder.h
+++ b/base/metrics/statistics_recorder.h
@@ -130,6 +130,14 @@ class BASE_EXPORT StatisticsRecorder {
   // histogram. This method is thread safe.
   static OnSampleCallback FindCallback(const std::string& histogram_name);
 
+  // Initializes logging histograms with --v=1. Safe to call several times.
+  // Is called from ctor but for browser it seems that it is more useful to
+  // start logging after statistics recorder, so we need to init log-on-shutdown
+  // later.
+  static void InitLogOnShutdown();
+
+  static bool VLogInitializedForTesting();
+
   // Clears all of the known histograms and resets static variables to a
   // state that allows a new initialization.
   static void ResetForTesting();
@@ -157,6 +165,7 @@ class BASE_EXPORT StatisticsRecorder {
   friend class SharedHistogramTest;
   friend class SparseHistogramTest;
   friend class StatisticsRecorderTest;
+  friend class StatisticsRecorderLoggingTestBase;
   FRIEND_TEST_ALL_PREFIXES(HistogramDeltaSerializationTest,
                            DeserializeHistogramAndAddSamples);
 
@@ -166,6 +175,8 @@ class BASE_EXPORT StatisticsRecorder {
   StatisticsRecorder();
   ~StatisticsRecorder();
 
+  void InitLogOnShutdownWithoutLock();
+
   static void Reset();
   static void DumpHistogramsToVlog(void* instance);