CRAS: Add histograms for Cras.DeviceVolume

The change is related to CL:2291484. Add histogram information in
histograms.xml to make the histogram visible on chromedashboard.

BUG=b:160939695

Change-Id: Ic528934c18e0c3094e37cc16069c61bd5c931002
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2311983
Commit-Queue: Yu-Hsuan Hsu <yuhsuan@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792376}

tools/metrics/histograms/histograms.xml

@@ -32668,6 +32668,17 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
   </summary>
 </histogram>
 
+<histogram name="Cras.DeviceVolume" units="level" expires_after="2021-07-22">
+<!-- Name completed by histogram_suffixes
+     name="Cras.DeviceType" -->
+
+  <owner>yuhsuan@chromium.org</owner>
+  <owner>chromeos-audio@google.com</owner>
+  <summary>
+    The volume of a device, which is recorded when closing a device.
+  </summary>
+</histogram>
+
 <histogram name="Cras.HfpBatteryIndicatorSupported"
     enum="CrasHfpBatteryIndicator" expires_after="2020-12-01">
   <owner>enshuo@chromium.org</owner>
@@ -200572,6 +200583,38 @@ regressions. -->
   <affected-histogram name="Cras.StreamSamplingRate.Output"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="Cras.DeviceType" separator=".">
+  <suffix name="A2DP" label="Bluetooth A2DP."/>
+  <suffix name="AbnormalFallback"
+      label="Abnormal use case on the fallback device."/>
+  <suffix name="AlsaLoopback" label="ALSA loopback Device."/>
+  <suffix name="Bluetooth" label="Bluetooth device."/>
+  <suffix name="BluetoothNarrowBandMic" label="Bluetooth with NarrowBand Mic."/>
+  <suffix name="BluetoothWideBandMic" label="Bluetooth with WideBand Mic."/>
+  <suffix name="FrontMic" label="Front mic."/>
+  <suffix name="Haptic" label="Haptic device."/>
+  <suffix name="HDMI" label="HDMI device."/>
+  <suffix name="Headphone" label="Headphone."/>
+  <suffix name="HFP" label="Bluetooth HFP."/>
+  <suffix name="Hotword" label="Hotword device."/>
+  <suffix name="HSP" label="Bluetooth HSP."/>
+  <suffix name="InternalMic" label="Internal mic."/>
+  <suffix name="InternalSpeaker" label="Internal speaker."/>
+  <suffix name="InvalidType" label="Invalid type. It should not be used."/>
+  <suffix name="KeyboardMic" label="Keyboard mic."/>
+  <suffix name="Lineout" label="Line out."/>
+  <suffix name="Mic" label="External mic."/>
+  <suffix name="NoDevice" label="No device. It should not be used."/>
+  <suffix name="NormalFallback" label="Fallback device."/>
+  <suffix name="PostDspLoopback" label="Post DSP loopback."/>
+  <suffix name="PostMixLoopback" label="Post Mix loopback."/>
+  <suffix name="RearMic" label="Rear mic."/>
+  <suffix name="SilentHotword" label="Silent hotword device."/>
+  <suffix name="Unknown" label="Unknown device. It should not be used."/>
+  <suffix name="USB" label="USB device."/>
+  <affected-histogram name="Cras.DeviceVolume"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="Cras.Direction" separator=".">
   <suffix name="Input" label="Capture"/>
   <suffix name="Output" label="Playback"/>