[Files App] Add observed enumeration value for password handling

Add "need password" enumeration values for the CrosDisksClientMountError
and CrosDisksMountTypeError metrics.

Bug: 912236
Change-Id: I099c9801f5fd1651fae016c89472e084f06651cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303935
Commit-Queue: François Degros <fdegros@chromium.org>
Reviewed-by: François Degros <fdegros@chromium.org>
Reviewed-by: Jeremie Boulic <jboulic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790757}

tools/metrics/histograms/enums.xml

@@ -13384,6 +13384,7 @@ to ensure that the crash string is shown properly on the user-facing crash UI.
   <int value="14" label="Unknown filesystem"/>
   <int value="15" label="Unsupported filesystem"/>
   <int value="16" label="Invalid archive"/>
+  <int value="17" label="Need password"/>
 </enum>
 
 <enum name="CrosDisksDeviceMediaType">
@@ -13461,6 +13462,7 @@ to ensure that the crash string is shown properly on the user-facing crash UI.
   <int value="214" label="Archive - Unknown filesystem"/>
   <int value="215" label="Archive - Unsupported filesystem"/>
   <int value="216" label="Archive - Invalid archive"/>
+  <int value="217" label="Archive - Need password"/>
   <int value="300" label="Network - Success"/>
   <int value="301" label="Network - Unknown"/>
   <int value="302" label="Network - Internal"/>