Avoid potential division by 0 in AudioSyncReader UMA stats calculation

Quite unlikely, but still possible. BUG= Review URL: https://codereview.chromium.org/1743573002 Cr-Commit-Position: refs/heads/master@{#377888}
Denger-Network · Feb 26, 2016 · 0635acd · 0635acd
1 parent 2d2b8a0
commit 0635acd
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/content/browser/renderer_host/media/audio_sync_reader.cc b/content/browser/renderer_host/media/audio_sync_reader.cc
@@ -82,6 +82,9 @@ AudioSyncReader::~AudioSyncReader() {
   renderer_missed_callback_count_ -= trailing_renderer_missed_callback_count_;
   renderer_callback_count_ -= trailing_renderer_missed_callback_count_;
 
+  if (!renderer_callback_count_)
+    return;
+
   // Recording the percentage of deadline misses gives us a rough overview of
   // how many users might be running into audio glitches.
   int percentage_missed =