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

media/base/audio_parameters.h

Index: media/base/audio_parameters.h
diff --git a/media/base/audio_parameters.h b/media/base/audio_parameters.h
index e41267d533ae7aa762873dcc2a34221c25d7252f..37f760d4375babfdc90e507e314da72405185cf6 100644
--- a/media/base/audio_parameters.h
+++ b/media/base/audio_parameters.h
@@ -12,6 +12,7 @@
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "media/base/audio_bus.h"
+#include "media/base/audio_latency.h"
 #include "media/base/audio_point.h"
 #include "media/base/channel_layout.h"
 #include "media/base/media_export.h"
@@ -174,6 +175,11 @@ class MEDIA_EXPORT AudioParameters {
   }
   const std::vector<Point>& mic_positions() const { return mic_positions_; }
 
+  void set_latency_tag(AudioLatency::LatencyType latency_tag) {
+    latency_tag_ = latency_tag;
+  }
+  AudioLatency::LatencyType latency_tag() const { return latency_tag_; }
+
   AudioParameters(const AudioParameters&);
   AudioParameters& operator=(const AudioParameters&);
 
@@ -202,6 +208,9 @@ class MEDIA_EXPORT AudioParameters {
   //
   // An empty vector indicates unknown positions.
   std::vector<Point> mic_positions_;
+
+  // Optional tag to pass latency info from renderer to browser.
+  AudioLatency::LatencyType latency_tag_;
 };
 
 // Comparison is useful when AudioParameters is used with std structures.