Desks: Add autotestPrivate APIs to interact with Virtual Desks

Expose a limited API through autotest private to interact with
Virtual Desks, so that we can later invoke those APIs from Tast
tests.

BUG=1016994
TEST=Added new tests

Change-Id: I43d0f4d8c85f95c1b2bfb4aa97107bdc2f24623c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895742
Commit-Queue: Ahmed Fakhry <[email protected]>
Reviewed-by: Steven Bennetts <[email protected]>
Reviewed-by: James Cook <[email protected]>
Cr-Commit-Position: refs/heads/master@{#712868}
diff --git a/extensions/browser/extension_function_histogram_value.h b/extensions/browser/extension_function_histogram_value.h
index 0534d40..54fc5cd8 100644
--- a/extensions/browser/extension_function_histogram_value.h
+++ b/extensions/browser/extension_function_histogram_value.h
@@ -1461,6 +1461,9 @@
   AUTOTESTPRIVATE_INSTALLPWAFORCURRENTURL = 1398,
   AUTOTESTPRIVATE_ACTIVATEACCELERATOR = 1399,
   AUTOTESTPRIVATE_WAITFORLAUNCHERSTATE = 1400,
+  AUTOTESTPRIVATE_CREATENEWDESK = 1401,
+  AUTOTESTPRIVATE_ACTIVATEDESKATINDEX = 1402,
+  AUTOTESTPRIVATE_REMOVEACTIVEDESK = 1403,
   // Last entry: Add new entries above, then run:
   // python tools/metrics/histograms/update_extension_histograms.py
   ENUM_BOUNDARY