Support sample rates up to 384 kHz.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index edfe252772965e0350e02f6d75f453a54ef84ed6..60f1d69364fe032ddd4a0d63efe63ba79c1c3aad 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -65830,6 +65830,19 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="WebAudio.AudioBuffer.SampleRate" units="Hz">
+  <obsolete>
+    Replaced by SampleRate384k in Issue 644683 on 2016/09 due to higher
+    supported sample rates.
+  </obsolete>
+  <owner>rtoy@chromium.org</owner>
+  <owner>hongchan@chromium.org</owner>
+  <summary>
+    The sample rate (in Hz) requested by createBuffer(). Recorded for every call
+    to createBuffer(). Probably many (tens or hundreds) per page.
+  </summary>
+</histogram>
+
+<histogram name="WebAudio.AudioBuffer.SampleRate384" units="Hz">

[Mark P, 2016/09/15 23:16:31]

You left off the "k" in the histogram name.

Also, your histograms sometimes use "k" and sometimes use "K" in the emit lines,
though always seem to use "k" (when you remember it!) here.  Please be
consistent (upper or lower case) for all these histograms, and definitely be
consistent for the same histogram between the emit line and histograms.xml.

[Raymond Toy, 2016/10/10 16:28:32]

Renamed them all to say "384kHz".

   <owner>rtoy@chromium.org</owner>
   <owner>hongchan@chromium.org</owner>
   <summary>
@@ -65839,6 +65852,21 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="WebAudio.AudioBuffer.SampleRateRatio">
+  <obsolete>
+    Replaced by SampleRateRatio384k in Issue 644683 on 2016/09 due to higher
+    supported sample rates.
+  </obsolete>
+  <owner>rtoy@chromium.org</owner>
+  <owner>hongchan@chromium.org</owner>
+  <summary>
+    The ratio of the buffer sample rate from createBuffer() to the context
+    sample rate. This indicates if the buffer needs to be resampled.  Recorded
+    for every call to createBuffer().  Probably many (tens or hundreds) per
+    page.
+  </summary>
+</histogram>
+
+<histogram name="WebAudio.AudioBuffer.SampleRateRatio384k">
   <owner>rtoy@chromium.org</owner>
   <owner>hongchan@chromium.org</owner>
   <summary>
@@ -65961,6 +65989,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="WebAudio.OfflineAudioContext.SampleRate384k" units="Hz">
+  <owner>rtoy@chromium.org</owner>
+  <owner>hongchan@chromium.org</owner>
+  <summary>
+    The sample rate (in Hz) specified for the offline audio context. Recorded
+    for every offline context created.  Probably only a few per page, but could
+    be potentially much more (thousands).
+  </summary>
+</histogram>
+
 <histogram name="WebAudio.PannerNode.PanningModel" enum="PanningModelType">
   <owner>rtoy@chromium.org</owner>
   <owner>hongchan@chromium.org</owner>