Report timing statistics for audio controller methods via UMA.

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 46d4e4e9fee32c2bb26d3cef659e0cde4e46de6f..a455b3a45d1665fbd19b1421385ebcb91d27af32 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -990,6 +990,55 @@ other types of suffix sets.
   <summary>The version of glibc used. (Linux only)</summary>
 </histogram>
 
+<histogram name="Media.AudioInputController.CloseTime" units="ms">
+  <summary>
+    Measures the time taken for AudioInputController::DoClose().
+  </summary>
+</histogram>
+
+<histogram name="Media.AudioInputController.CreateTime" units="ms">
+  <summary>
+    Measures the time taken for AudioInputController::DoCreate().
+  </summary>
+</histogram>
+
+<histogram name="Media.AudioInputController.RecordTime" units="ms">
+  <summary>
+    Measures the time taken for AudioInputController::DoRecord().
+  </summary>
+</histogram>
+
+<histogram name="Media.AudioOutputController.CloseTime" units="ms">
+  <summary>
+    Measures the time taken for AudioOutputController::DoClose().
+  </summary>
+</histogram>
+
+<histogram name="Media.AudioOutputController.CreateTime" units="ms">
+  <summary>
+    Measures the time taken for AudioOutputController::DoCreate().
+  </summary>
+</histogram>
+
+<histogram name="Media.AudioOutputController.DeviceChangeTime" units="ms">
+  <summary>
+    Measures the time taken for AudioOutputController::OnDeviceChange().
+  </summary>
+</histogram>
+
+<histogram name="Media.AudioOutputController.PauseTime" units="ms">
+  <summary>
+    Measures the time taken for AudioOutputController::DoPause().
+  </summary>
+</histogram>
+
+<histogram name="Media.AudioOutputController.PlayTime" units="ms">
+  <summary>
+    Measures the time taken for AudioOutputController::DoPlay().  Technically
+    only the worker method AudioOutputController::PollAndStartIfDataReady().
+  </summary>
+</histogram>
+
 <histogram name="Media.AudioRendererEvents" enum="AudioRendererEvents">
   <summary>Captures statistics for various AudioRendererImpl events.</summary>
 </histogram>