UMA stats for browser/renderer audio rendering buffer size mismatch.

media/base/audio_parameters.cc

Index: media/base/audio_parameters.cc
diff --git a/media/base/audio_parameters.cc b/media/base/audio_parameters.cc
index c40a7aa0d4094657ae308945580fa2bd9b58ec13..e3f9bb514257707935dbbe3bdbfd7f7ed3c330d5 100644
--- a/media/base/audio_parameters.cc
+++ b/media/base/audio_parameters.cc
@@ -16,7 +16,8 @@ AudioParameters::AudioParameters(Format format,
                                  ChannelLayout channel_layout,
                                  int sample_rate,
                                  int bits_per_sample,
-                                 int frames_per_buffer) {
+                                 int frames_per_buffer)
+    : latency_tag_(AudioLatency::LATENCY_COUNT) {
   Reset(format, channel_layout, sample_rate, bits_per_sample,
         frames_per_buffer);
 }