[Cronet] Initialize StatisticsRecorder early

components/cronet/android/cronet_library_loader.cc

Index: components/cronet/android/cronet_library_loader.cc
diff --git a/components/cronet/android/cronet_library_loader.cc b/components/cronet/android/cronet_library_loader.cc
index 6d4d11730c8c0cd7adb5e4f8711007a5841d9e15..7dda7a8748b426f5cccd2199a772ab19927066f4 100644
--- a/components/cronet/android/cronet_library_loader.cc
+++ b/components/cronet/android/cronet_library_loader.cc
@@ -18,6 +18,7 @@
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
+#include "base/metrics/statistics_recorder.h"
 #include "components/cronet/android/cronet_bidirectional_stream_adapter.h"
 #include "components/cronet/android/cronet_upload_data_stream_adapter.h"
 #include "components/cronet/android/cronet_url_request_adapter.h"
@@ -100,6 +101,9 @@ void CronetInitOnMainThread(JNIEnv* env, const JavaParamRef<jclass>& jcaller) {
   DCHECK(!g_main_message_loop);
   g_main_message_loop = new base::MessageLoopForUI();
   base::MessageLoopForUI::current()->Start();
+  // Initializes the statistics recorder system. This needs to be done before
+  // emitting histograms to prevent memory leaks (crbug.com/707836).
+  base::StatisticsRecorder::Initialize();

[xunjieli, 2017/04/03 18:39:39]

Doing this on the main UI thread because NetworkChangeNotifier will emit
histograms. Not sure if this impacts startup performance.

   DCHECK(!g_network_change_notifier);
   net::NetworkChangeNotifier::SetFactory(
       new net::NetworkChangeNotifierFactoryAndroid());