Add UMA stats for open and fix memory leak

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 db0258319ce14ea934ea95de8bf9efb534e836ed..2ae20ebc3e67c0407141793da1368bbb11140cd0 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -24368,6 +24368,13 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Media.Audio.Capture.Win.Open" enum="AudioStreamOpenResult">
+  <owner>tommi@chromium.org</owner>
+  <summary>
+    Success/error cases for opening an audio input stream on Windows.
+  </summary>
+</histogram>
+
 <histogram name="Media.Audio.InputBufferSizeWasChangedAudioWorkedMac"
     enum="BooleanChanged">
   <owner>henrika@chromium.org</owner>
@@ -78956,6 +78963,23 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="12" label="384 kHz"/>
 </enum>
 
+<enum name="AudioStreamOpenResult" type="int">
+  <int value="0" label="OK"/>
+  <int value="1" label="CREATE_INSTANCE"/>
+  <int value="2" label="NO_ENDPOINT"/>
+  <int value="3" label="NO_STATE"/>
+  <int value="4" label="DEVICE_NOT_ACTIVE"/>
+  <int value="5" label="ACTIVATION_FAILED"/>
+  <int value="6" label="FORMAT_NOT_SUPPORTED"/>
+  <int value="7" label="AUDIO_CLIENT_INIT_FAILED"/>
+  <int value="8" label="GET_BUFFER_SIZE_FAILED"/>
+  <int value="9" label="LOOPBACK_ACTIVATE_FAILED"/>
+  <int value="10" label="LOOPBACK_INIT_FAILED"/>
+  <int value="11" label="SET_EVENT_HANDLE"/>
+  <int value="12" label="NO_CAPTURE_CLIENT"/>
+  <int value="13" label="NO_AUDIO_VOLUME"/>
+</enum>
+
 <enum name="AudioThreadStatus" type="int">
   <int value="0" label="None"/>
   <int value="1" label="Started"/>